diff --git a/storage/src/main/scala/org/grapheco/tudb/engine/GraphEngine.scala b/storage/src/main/scala/org/grapheco/tudb/engine/GraphEngine.scala
new file mode 100644
index 00000000..c4877291
--- /dev/null
+++ b/storage/src/main/scala/org/grapheco/tudb/engine/GraphEngine.scala
@@ -0,0 +1,8 @@
+package org.grapheco.tudb.engine
+
+import org.grapheco.tudb.store.storage.KeyValueDB
+
+// Functions of a GraphEngine should be similar to NodeStoreAPI/RelationshipStoreAPI currently
+class GraphEngine(storageInstance: KeyValueDB) {
+
+}
diff --git a/storage/src/main/scala/org/grapheco/tudb/engine/GraphEngineOnRockDB.scala b/storage/src/main/scala/org/grapheco/tudb/engine/GraphEngineOnRockDB.scala
deleted file mode 100644
index 92b96d89..00000000
--- a/storage/src/main/scala/org/grapheco/tudb/engine/GraphEngineOnRockDB.scala
+++ /dev/null
@@ -1,3 +0,0 @@
-package org.grapheco.tudb.engine
-
-class GraphEngineOnRockDB {}
diff --git a/storage/src/main/scala/org/grapheco/tudb/engine/NodeOpOnRocksDB.scala b/storage/src/main/scala/org/grapheco/tudb/engine/NodeOpOnRocksDB.scala
new file mode 100644
index 00000000..c95d3508
--- /dev/null
+++ b/storage/src/main/scala/org/grapheco/tudb/engine/NodeOpOnRocksDB.scala
@@ -0,0 +1,362 @@
+package org.grapheco.tudb.engine
+
+import org.grapheco.tudb.serializer.{BaseSerializer, NodeSerializer}
+import org.grapheco.tudb.store.index.IndexFactory
+import org.grapheco.tudb.store.meta.TypeManager.NodeId
+import org.grapheco.tudb.store.meta.{ConfigNameMap, DBNameMap, IdGenerator, NodeLabelNameStore, PropertyNameStore}
+import org.grapheco.tudb.store.node.{NodeLabelStore, NodeStore, NodeStoreSPI, StoredNodeWithProperty}
+import org.grapheco.tudb.store.storage.{KeyValueDB, RocksDBStorage}
+import org.rocksdb.{WriteBatch, WriteOptions}
+
+import scala.collection.mutable
+
+class NodeOpOnRocksDB(operationContext: OperationsContext) extends NodeOperations {
+  private val nodeDB =
+    RocksDBStorage.getDB(nodeDBPath, rocksdbConfigPath = nodeDBConfigPath)
+  private val nodeLabelDB = RocksDBStorage.getDB(
+    nodeLabelDBPath,
+    rocksdbConfigPath = nodeLabelConfigPath
+  )
+
+  // Fixme: Don't disable the WAL by hard code.
+  private val writeOptions = new WriteOptions()
+  writeOptions.setDisableWAL(true)
+  writeOptions.setIgnoreMissingColumnFamilies(true)
+  writeOptions.setSync(false)
+  private val nodeStore = new NodeStore(nodeDB)
+  private val nodeLabelStore = new NodeLabelStore(nodeLabelDB)
+  private val nodeLabelName = new NodeLabelNameStore(metaDB)
+  private val propertyName = new PropertyNameStore(metaDB)
+
+  private val idGenerator = new IdGenerator(nodeLabelDB, 200)
+  // this is the index engine instance
+  private val indexImpl = IndexFactory.newIndex(indexUri + "&path=" + dbPath)
+
+  val NONE_LABEL_ID: Int = 0
+
+  def this(
+      dbPath: String,
+      rocksdbCfgPath: String = "default",
+      metaDB: KeyValueDB,
+      indexUri: String
+    ) {
+    this(
+      s"${dbPath}/${DBNameMap.nodeDB}",
+      rocksdbCfgPath,
+      s"${dbPath}/${DBNameMap.nodeLabelDB}",
+      rocksdbCfgPath,
+      metaDB,
+      indexUri,
+      dbPath
+    )
+  }
+  //add all index
+  logger.info("start add index")
+  var addCount = 0
+  if (indexImpl.hasIndex() && needRebuildIndex()) {
+    //generate index for all node    use memory to speedup
+    val cacheHashMap = new mutable.HashMap[String, mutable.HashSet[Long]]()
+    allNodes().foreach { node =>
+      node.properties.foreach { property =>
+        val key = indexImpl.encodeKey(property._1, property._2)
+        if (cacheHashMap.contains(key)) {
+          cacheHashMap(key).add(node.id)
+          if (cacheHashMap(key).size >= 100000) { //batch add index TODO size can be config
+            indexImpl.batchAddIndex(key, cacheHashMap(key).toSet)
+            cacheHashMap(key).clear()
+          }
+        } else {
+          cacheHashMap(key) = new mutable.HashSet[Long]()
+          cacheHashMap(key).add(node.id)
+        }
+        addCount += 1
+      }
+    }
+    cacheHashMap.foreach { //batch add index
+      case (key, value) =>
+        indexImpl.batchAddIndex(key, value.toSet)
+    }
+  }
+  metaDB.put(ConfigNameMap.indexNameStorageKey, indexImpl.indexName.getBytes)
+  logger.info(f"load index ok,size:${addCount}")
+
+  /**
+    *
+    * @return true if need rebuild index
+    */
+  def needRebuildIndex(): Boolean = {
+    // check last time use index engine
+    val indexType = metaDB.get(ConfigNameMap.indexNameStorageKey)
+    if (indexType == null || indexType.length == 0) {
+      true
+    } else {
+      indexImpl.needRebuildIndex(indexType.toString)
+    }
+
+  }
+
+  def removePropertyIndexByNodeId(nodeId: Long): Unit = {
+    if (indexImpl.hasIndex()) {
+      getNodeById(nodeId).foreach { node =>
+        node.properties.foreach { property =>
+          indexImpl.removeIndex(indexImpl.encodeKey(property._1, property._2), node.id)
+        }
+      }
+    }
+  }
+
+  /**
+    * @see [[NodeStoreSPI.getNodeIdByProperty()]]
+    *  @return bool
+    */
+  def getNodeIdByProperty(propertyKey: Int, propertyValue: Any): Set[Long] = {
+    indexImpl.getIndexByKey(indexImpl.encodeKey(propertyKey, propertyValue))
+  }
+
+  /**
+    * @see [[NodeStoreSPI.hasIndex()]]
+    *  @return bool
+    */
+  def hasIndex(): Boolean = {
+    indexImpl.hasIndex()
+  }
+
+  override def allLabels(): Array[String] =
+    nodeLabelName.mapString2Int.keys.toArray
+
+  override def allLabelIds(): Array[Int] =
+    nodeLabelName.mapInt2String.keys.toArray
+
+  override def getLabelName(labelId: Int): Option[String] =
+    nodeLabelName.key(labelId)
+
+  override def getLabelId(labelName: String): Option[Int] =
+    nodeLabelName.id(labelName)
+
+  override def getLabelIds(labelNames: Set[String]): Set[Int] =
+    nodeLabelName.ids(labelNames)
+
+  override def addLabel(labelName: String): Int =
+    nodeLabelName.getOrAddId(labelName)
+
+  override def allPropertyKeys(): Array[String] =
+    propertyName.mapString2Int.keys.toArray
+
+  override def allPropertyKeyIds(): Array[Int] =
+    propertyName.mapInt2String.keys.toArray
+
+  override def getPropertyKeyName(keyId: Int): Option[String] =
+    propertyName.key(keyId)
+
+  override def getPropertyKeyId(keyName: String): Option[Int] =
+    propertyName.id(keyName)
+
+  override def addPropertyKey(keyName: String): Int =
+    propertyName.getOrAddId(keyName)
+
+  override def getNodeById(nodeId: Long): Option[StoredNodeWithProperty] = {
+    nodeLabelStore.get(nodeId).map(nodeStore.get(nodeId, _).get)
+  }
+
+  override def getNodeById(nodeId: Long, label: Int): Option[StoredNodeWithProperty] =
+    nodeStore.get(nodeId, label)
+
+  override def getNodeLabelsById(nodeId: Long): Array[Int] =
+    nodeLabelStore.getAll(nodeId)
+
+  override def hasLabel(nodeId: Long, label: Int): Boolean =
+    nodeLabelStore.exist(nodeId, label)
+
+  override def nodeAddLabel(nodeId: Long, labelId: Int): Unit =
+    getNodeById(nodeId)
+      .foreach { node =>
+        if (!node.labelIds.contains(labelId)) {
+          val labels = node.labelIds ++ Array(labelId)
+          nodeLabelStore.set(nodeId, labelId)
+          val nodeInBytes: Array[Byte] = NodeSerializer
+            .encodeNodeWithProperties(node.id, labels, node.properties)
+          nodeStore.set(
+            new StoredNodeWithProperty(node.id, labels, nodeInBytes)
+          )
+          // if node is nonLabel node, delete it
+          if (node.labelIds.isEmpty) {
+            nodeLabelStore.delete(nodeId, NONE_LABEL_ID)
+            nodeStore.delete(nodeId, NONE_LABEL_ID)
+          }
+        }
+      }
+
+  override def nodeRemoveLabel(nodeId: Long, labelId: Int): Unit =
+    nodeStore
+      .get(nodeId, labelId)
+      .foreach { node =>
+        if (node.labelIds.contains(labelId)) {
+          val labels = node.labelIds.filter(_ != labelId)
+          val nodeInBytes: Array[Byte] = NodeSerializer
+            .encodeNodeWithProperties(node.id, labels, node.properties)
+          val newNode = new StoredNodeWithProperty(node.id, labels, nodeInBytes)
+          // if a node has only one label, add NONE_LABEL_ID after delete it
+          if (node.labelIds.length == 1) {
+            nodeLabelStore.set(nodeId, NONE_LABEL_ID)
+            nodeStore.set(NONE_LABEL_ID, newNode)
+          }
+          nodeLabelStore.delete(node.id, labelId)
+          nodeStore.set(newNode)
+          nodeStore.delete(nodeId, labelId)
+        }
+      }
+
+  override def nodeSetProperty(nodeId: Long, propertyKeyId: Int, propertyValue: Any): Unit = {
+    getNodeById(nodeId)
+      .foreach { node =>
+        {
+          val nodeInBytes: Array[Byte] =
+            NodeSerializer.encodeNodeWithProperties(
+              node.id,
+              node.labelIds,
+              node.properties ++ Map(propertyKeyId -> propertyValue)
+            )
+          nodeStore.set(
+            new StoredNodeWithProperty(node.id, node.labelIds, nodeInBytes)
+          )
+          //add node id to index
+          indexImpl.addIndex(indexImpl.encodeKey(propertyKeyId, propertyValue), nodeId)
+        }
+      }
+  }
+
+  override def nodeRemoveProperty(nodeId: Long, propertyKeyId: Int): Any = {
+    getNodeById(nodeId)
+      .foreach { node =>
+        {
+          val nodeInBytes: Array[Byte] =
+            NodeSerializer.encodeNodeWithProperties(
+              node.id,
+              node.labelIds,
+              node.properties - propertyKeyId
+            )
+          nodeStore.set(
+            new StoredNodeWithProperty(node.id, node.labelIds, nodeInBytes)
+          )
+          //remove node id from index
+          node.properties
+            .get(propertyKeyId)
+            .map(propertyValue =>
+              indexImpl.removeIndex(indexImpl.encodeKey(propertyKeyId, propertyValue), nodeId)
+            )
+        }
+      }
+  }
+
+  override def addNode(node: StoredNodeWithProperty): Unit = {
+    if (node.labelIds != null && node.labelIds.length > 0) {
+      nodeStore.set(node)
+      nodeLabelStore.set(node.id, node.labelIds)
+    } else {
+      nodeStore.set(NONE_LABEL_ID, node)
+      nodeLabelStore.set(node.id, NONE_LABEL_ID)
+    }
+    //add node id to index
+    node.properties.foreach { property =>
+      indexImpl.addIndex(indexImpl.encodeKey(property._1, property._2), node.id)
+    }
+  }
+
+  override def addNode(nodeId: NodeId, labelIds: Array[Int], props: Map[Int, Any]): Unit = {
+    addNode(new StoredNodeWithProperty(nodeId, labelIds, props))
+  }
+
+  override def allNodes(): Iterator[StoredNodeWithProperty] = nodeStore.all()
+
+  override def nodesCount: Long = nodeLabelStore.getNodesCount
+
+  override def getNodesByLabel(labelId: Int): Iterator[StoredNodeWithProperty] =
+    nodeStore.getNodesByLabel(labelId)
+
+  // Fixme: This func is slow, because it needs to finish all the search before return the final iter.
+  override def getNodesByLabels(labelIds: Seq[Int]): Iterator[StoredNodeWithProperty] =
+    labelIds.flatMap(labelId => nodeStore.getNodesByLabel(labelId)).toIterator
+
+  override def getNodeById(nodeId: Long, label: Option[Int]): Option[StoredNodeWithProperty] =
+    label.map(getNodeById(nodeId, _)).getOrElse(getNodeById(nodeId))
+
+  override def getNodeIdsByLabel(labelId: Int): Iterator[Long] =
+    nodeStore.getNodeIdsByLabel(labelId)
+
+  override def deleteNode(nodeId: Long): Unit = {
+    removePropertyIndexByNodeId(nodeId)
+    nodeLabelStore
+      .getAll(nodeId)
+      .foreach(labelId => nodeStore.delete(nodeId, labelId))
+    nodeLabelStore.delete(nodeId)
+  }
+
+  override def deleteNodes(nodeIDs: Iterator[NodeId]): Unit = {
+    val nodesWB = new WriteBatch()
+    val labelWB = new WriteBatch()
+    nodeIDs.foreach(nid => {
+      nodeLabelStore
+        .getAll(nid)
+        .foreach(lid => {
+          nodesWB.delete(NodeSerializer.encodeNodeKey(nid, lid))
+        })
+      labelWB.deleteRange(
+        NodeSerializer.encodeNodeKey(nid, 0),
+        NodeSerializer.encodeNodeKey(nid, -1)
+      )
+      removePropertyIndexByNodeId(nid)
+    })
+    nodeDB.write(writeOptions, nodesWB) //TODO Important! to guarantee atomic
+    nodeLabelDB.write(
+      writeOptions,
+      labelWB
+    ) //TODO Important! to guarantee atomic
+  }
+
+  // big cost
+  override def deleteNodesByLabel(labelId: Int): Unit = {
+    nodeStore
+      .getNodeIdsByLabel(labelId)
+      .foreach { nodeid =>
+        nodeLabelStore
+          .getAll(nodeid)
+          .foreach {
+            nodeStore.delete(nodeid, _)
+          }
+        nodeLabelStore.delete(nodeid)
+        removePropertyIndexByNodeId(nodeid)
+      }
+    nodeStore.deleteByLabel(labelId)
+  }
+
+  override def close(): Unit = {
+    indexImpl.close()
+    nodeDB.close()
+    nodeLabelDB.close()
+    metaDB.close()
+  }
+
+  override def newNodeId(): Long = {
+    idGenerator.nextId()
+  }
+
+  override def refreshMeta(): Unit = {}
+
+  override def cleanData(): Unit = {}
+
+  override def serializeLabelIdsToBytes(labelIds: Array[Int]): Array[Byte] = {
+    BaseSerializer.encodeArray(labelIds)
+  }
+
+  override def deserializeBytesToLabelIds(bytes: Array[Byte]): Array[Int] = {
+    NodeSerializer.decodeNodeLabelIds(bytes)
+  }
+
+  override def serializePropertiesToBytes(properties: Map[Int, Any]): Array[Byte] = {
+    NodeSerializer.encodeNodeProperties(properties)
+  }
+
+  override def deserializeBytesToProperties(bytes: Array[Byte]): Map[Int, Any] = {
+    BaseSerializer.decodePropMap(bytes)
+  }
+}
diff --git a/storage/src/main/scala/org/grapheco/tudb/engine/NodeOperations.scala b/storage/src/main/scala/org/grapheco/tudb/engine/NodeOperations.scala
new file mode 100644
index 00000000..1ee692dc
--- /dev/null
+++ b/storage/src/main/scala/org/grapheco/tudb/engine/NodeOperations.scala
@@ -0,0 +1,86 @@
+package org.grapheco.tudb.engine
+import org.grapheco.tudb.graph.Node
+
+import com.typesafe.scalalogging.LazyLogging
+
+trait NodeOperations extends LazyLogging {
+
+  def getNodeIdByProperty(propertyKey: Int, propertyValue: Any): Set[Long]
+
+  def hasIndex(): Boolean
+
+  def refreshMeta(): Unit
+
+  def newNodeId(): Long;
+
+  def cleanData(): Unit
+
+  def hasLabel(nodeId: Long, label: Int): Boolean;
+
+  def addNode(node: Node): Unit
+
+  def addNode(nodeId: Long, labelIds: Array[Int], props: Map[Int, Any]): Unit
+
+  def addLabel(labelName: String): Int;
+
+  def addPropertyKey(keyName: String): Int;
+
+  def nodeAddLabel(nodeId: Long, labelId: Int): Unit;
+
+  def nodeRemoveLabel(nodeId: Long, labelId: Int): Unit;
+
+  def nodeSetProperty(nodeId: Long, propertyKeyId: Int, propertyValue: Any): Unit;
+
+  def nodeRemoveProperty(nodeId: Long, propertyKeyId: Int): Any;
+
+  def deleteNode(nodeId: Long): Unit;
+
+  def deleteNodes(nodeIDs: Iterator[Long]): Unit;
+
+  def deleteNodesByLabel(labelId: Int): Unit
+
+  def getLabelName(labelId: Int): Option[String];
+
+  def getLabelId(labelName: String): Option[Int];
+
+  def getLabelIds(labelNames: Set[String]): Set[Int]
+
+  def getPropertyKeyName(keyId: Int): Option[String];
+
+  def getPropertyKeyId(keyName: String): Option[Int];
+
+  def getNodeById(nodeId: Long): Option[Node]
+
+  def getNodeById(nodeId: Long, label: Int): Option[Node]
+
+  def getNodeById(nodeId: Long, label: Option[Int]): Option[Node]
+
+  def getNodesByLabel(labelId: Int): Iterator[Node];
+  def getNodesByLabels(labelIds: Seq[Int]): Iterator[Node]
+
+  def getNodeIdsByLabel(labelId: Int): Iterator[Long];
+
+  def getNodeLabelsById(nodeId: Long): Array[Int];
+
+  def serializeLabelIdsToBytes(labelIds: Array[Int]): Array[Byte];
+
+  def deserializeBytesToLabelIds(bytes: Array[Byte]): Array[Int];
+
+  def serializePropertiesToBytes(properties: Map[Int, Any]): Array[Byte];
+
+  def deserializeBytesToProperties(bytes: Array[Byte]): Map[Int, Any];
+
+  def allLabels(): Array[String];
+
+  def allLabelIds(): Array[Int];
+
+  def allPropertyKeys(): Array[String];
+
+  def allPropertyKeyIds(): Array[Int];
+
+  def allNodes(): Iterator[Node]
+
+  def nodesCount: Long
+
+  def close(): Unit
+}
diff --git a/storage/src/main/scala/org/grapheco/tudb/engine/OperationsContext.scala b/storage/src/main/scala/org/grapheco/tudb/engine/OperationsContext.scala
new file mode 100644
index 00000000..d141900b
--- /dev/null
+++ b/storage/src/main/scala/org/grapheco/tudb/engine/OperationsContext.scala
@@ -0,0 +1,20 @@
+package org.grapheco.tudb.engine
+
+import org.grapheco.tudb.ContextMap
+import org.grapheco.tudb.store.storage.KeyValueDB
+
+class OperationsContext extends ContextMap {
+
+  def setNodeDB(db: KeyValueDB) = super.put("__node_db__", db)
+  def getNodeDB() = super.get("__node_db__")
+
+  def setRelationshipDB(db: KeyValueDB) = super.put("__relationship_db__", db)
+  def getRelationshipDB() = super.get("__relationship_db__")
+
+  def setIndexDB(db: KeyValueDB) = super.put("__index_db__", db)
+  def getIndexDB() = super.get("__index_db__")
+
+  def setMetaDB(db: KeyValueDB) = super.put("__meta_db__", db)
+  def getMetaDB() = super.get("__meta_db__")
+
+}
diff --git a/storage/src/main/scala/org/grapheco/tudb/engine/RelationshipOperations.scala b/storage/src/main/scala/org/grapheco/tudb/engine/RelationshipOperations.scala
new file mode 100644
index 00000000..05249b79
--- /dev/null
+++ b/storage/src/main/scala/org/grapheco/tudb/engine/RelationshipOperations.scala
@@ -0,0 +1,84 @@
+package org.grapheco.tudb.engine
+
+import org.grapheco.tudb.graph.Relationship
+
+trait RelationshipOperations {
+  def allRelationshipTypes(): Array[String];
+
+  def allRelationshipTypeIds(): Array[Int];
+
+  def relationCount: Long
+
+  def getRelationshipTypeName(relationTypeId: Int): Option[String];
+
+  def getRelationshipTypeId(relationTypeName: String): Option[Int];
+
+  def addRelationshipType(relationTypeName: String): Int;
+
+  def allPropertyKeys(): Array[String];
+
+  def allPropertyKeyIds(): Array[Int];
+
+  def getPropertyKeyName(keyId: Int): Option[String];
+
+  def getPropertyKeyId(keyName: String): Option[Int];
+
+  def addPropertyKey(keyName: String): Int;
+
+  def getRelationshipById(relId: Long): Option[Relationship];
+
+  def getRelationshipIdsByRelationshipType(relationTypeId: Int): Iterator[Long];
+
+  def relationshipSetProperty(relationId: Long, propertyKeyId: Int, propertyValue: Any): Unit;
+
+  def relationshipRemoveProperty(relationId: Long, propertyKeyId: Int): Any;
+
+  def deleteRelationship(relationId: Long): Unit;
+
+  def findToNodeIds(fromNodeId: Long): Iterator[Long];
+
+  def findToNodeIds(fromNodeId: Long, relationType: Int): Iterator[Long];
+
+  def findFromNodeIds(toNodeId: Long): Iterator[Long];
+
+  def findFromNodeIds(toNodeId: Long, relationType: Int): Iterator[Long];
+
+  def newRelationshipId(): Long;
+
+  def addRelationship(relation: Relationship): Unit
+
+  def addRelationship(
+      relationshipId: Long,
+      fromId: Long,
+      toId: Long,
+      typeId: Int,
+      props: Map[Int, Any]
+    )
+
+  def allRelationships(): Iterator[Relationship]
+  def allRelationshipsWithProperty(): Iterator[Relationship]
+
+  def findOutRelationships(fromNodeId: Long): Iterator[Relationship] =
+    findOutRelationships(fromNodeId, None)
+
+  def findOutRelationships(fromNodeId: Long, edgeType: Option[Int] = None): Iterator[Relationship]
+
+  def findInRelationships(toNodeId: Long): Iterator[Relationship] =
+    findInRelationships(toNodeId, None)
+
+  def findInRelationships(toNodeId: Long, edgeType: Option[Int] = None): Iterator[Relationship]
+
+  def findInRelationshipsBetween(
+      toNodeId: Long,
+      fromNodeId: Long,
+      edgeType: Option[Int] = None
+    ): Iterator[Relationship]
+
+  def findOutRelationshipsBetween(
+      fromNodeId: Long,
+      toNodeId: Long,
+      edgeType: Option[Int] = None
+    ): Iterator[Relationship]
+
+  def close(): Unit
+}