diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/GraphTransaction.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/GraphTransaction.java
index 750b74e037..67a661bb31 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/GraphTransaction.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/tx/GraphTransaction.java
@@ -103,6 +103,8 @@ public class GraphTransaction extends IndexableTransaction {
 
     private LockUtil.LocksTable locksTable;
 
+    private final boolean checkVertexExist;
+
     private final int vertexesCapacity;
     private final int edgesCapacity;
 
@@ -113,6 +115,8 @@ public GraphTransaction(HugeGraph graph, BackendStore store) {
         assert !this.indexTx.autoCommit();
 
         final HugeConfig conf = graph.configuration();
+        this.checkVertexExist = conf.get(
+                                CoreOptions.VERTEX_CHECK_CUSTOMIZED_ID_EXIST);
         this.vertexesCapacity = conf.get(CoreOptions.VERTEX_TX_CAPACITY);
         this.edgesCapacity = conf.get(CoreOptions.EDGE_TX_CAPACITY);
         this.locksTable = new LockUtil.LocksTable();
@@ -208,6 +212,9 @@ protected BackendMutation prepareCommit() {
 
     protected void prepareAdditions(Map<Id, HugeVertex> addedVertexes,
                                     Map<Id, HugeEdge> addedEdges) {
+        if (this.checkVertexExist) {
+            this.checkVertexExistIfCustomizedId(addedVertexes);
+        }
         // Do vertex update
         for (HugeVertex v : addedVertexes.values()) {
             assert !v.removed();
@@ -236,6 +243,33 @@ protected void prepareAdditions(Map<Id, HugeVertex> addedVertexes,
         }
     }
 
+    private void checkVertexExistIfCustomizedId(Map<Id, HugeVertex> vertices) {
+        Set<Id> ids = new HashSet<>();
+        for (HugeVertex vertex : vertices.values()) {
+            VertexLabel vl = vertex.schemaLabel();
+            if (!vl.hidden() && vl.idStrategy().isCustomized()) {
+                ids.add(vertex.id());
+            }
+        }
+        if (ids.isEmpty()) {
+            return;
+        }
+        IdQuery idQuery = new IdQuery(HugeType.VERTEX, ids);
+        Iterator<HugeVertex> results = this.queryVerticesFromBackend(idQuery);
+        if (results.hasNext()) {
+            HugeVertex existedVertex = results.next();
+            HugeVertex newVertex = vertices.get(existedVertex.id());
+            if (!existedVertex.label().equals(newVertex.label())) {
+                throw new HugeException(
+                          "The newly added vertex with id:'%s' label:'%s' " +
+                          "is not allowed to insert, because already exist " +
+                          "a vertex with same id and different label:'%s'",
+                          newVertex.id(), newVertex.label(),
+                          existedVertex.label());
+            }
+        }
+    }
+
     protected void prepareDeletions(Map<Id, HugeVertex> removedVertexes,
                                     Map<Id, HugeEdge> removedEdges) {
         // Remove related edges of each vertex
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/config/CoreOptions.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/config/CoreOptions.java
index cf28893ccf..ffe41771b0 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/config/CoreOptions.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/config/CoreOptions.java
@@ -111,6 +111,15 @@ public static synchronized CoreOptions instance() {
                     "vertex"
             );
 
+    public static final ConfigOption<Boolean> VERTEX_CHECK_CUSTOMIZED_ID_EXIST =
+            new ConfigOption<>(
+                    "vertex.check_customzied_id_exist",
+                    "Whether to check the vertices exist for those using " +
+                    "customized id strategy",
+                    disallowEmpty(),
+                    true
+            );
+
     public static final ConfigOption<Integer> VERTEX_TX_CAPACITY =
             new ConfigOption<>(
                     "vertex.tx_capacity",
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/type/define/IdStrategy.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/type/define/IdStrategy.java
index 1ecc632902..c85bc82422 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/type/define/IdStrategy.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/type/define/IdStrategy.java
@@ -52,4 +52,16 @@ public byte code() {
     public String string() {
         return this.name;
     }
+
+    public boolean isAutomatic() {
+        return this == AUTOMATIC;
+    }
+
+    public boolean isPrimaryKey() {
+        return this == PRIMARY_KEY;
+    }
+
+    public boolean isCustomized() {
+        return this == CUSTOMIZE_STRING || this == CUSTOMIZE_NUMBER;
+    }
 }
diff --git a/hugegraph-test/src/main/java/com/baidu/hugegraph/core/VertexCoreTest.java b/hugegraph-test/src/main/java/com/baidu/hugegraph/core/VertexCoreTest.java
index 4758360849..827ad4a59f 100644
--- a/hugegraph-test/src/main/java/com/baidu/hugegraph/core/VertexCoreTest.java
+++ b/hugegraph-test/src/main/java/com/baidu/hugegraph/core/VertexCoreTest.java
@@ -37,6 +37,7 @@
 import org.junit.Before;
 import org.junit.Test;
 
+import com.baidu.hugegraph.HugeException;
 import com.baidu.hugegraph.HugeGraph;
 import com.baidu.hugegraph.backend.BackendException;
 import com.baidu.hugegraph.backend.id.Id;
@@ -3194,6 +3195,35 @@ public void testQueryByLabelIndexWithLimitAndOffset() {
         Assert.assertTrue(vertices.containsAll(vertices1));
     }
 
+    @Test
+    public void testAddCustomizedIdVerticesContainsExisted() {
+        HugeGraph graph = graph();
+        SchemaManager schema = graph.schema();
+
+        schema.vertexLabel("programmer")
+              .useCustomizeStringId()
+              .properties("name", "age", "city")
+              .create();
+        schema.vertexLabel("designer")
+              .useCustomizeStringId()
+              .properties("name", "age", "city")
+              .create();
+
+        graph.addVertex(T.label, "programmer", T.id, "123456", "name", "marko",
+                        "age", 18, "city", "Beijing");
+        graph.tx().commit();
+
+        graph.addVertex(T.label, "programmer", T.id, "123456", "name", "marko",
+                        "age", 19, "city", "Beijing");
+        graph.tx().commit();
+
+        graph.addVertex(T.label, "designer", T.id, "123456", "name", "marko",
+                        "age", 18, "city", "Beijing");
+        Assert.assertThrows(HugeException.class, () -> {
+            graph.tx().commit();
+        });
+    }
+
     private void init10Vertices() {
         HugeGraph graph = graph();