diff --git a/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/UnitTestSuite.java b/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/UnitTestSuite.java
index e6e4a3b203..1de772539a 100644
--- a/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/UnitTestSuite.java
+++ b/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/UnitTestSuite.java
@@ -47,6 +47,7 @@
 import com.baidu.hugegraph.unit.id.EdgeIdTest;
 import com.baidu.hugegraph.unit.id.IdTest;
 import com.baidu.hugegraph.unit.id.IdUtilTest;
+import com.baidu.hugegraph.unit.id.SplicingIdGeneratorTest;
 import com.baidu.hugegraph.unit.mysql.MysqlUtilTest;
 import com.baidu.hugegraph.unit.mysql.WhereBuilderTest;
 import com.baidu.hugegraph.unit.rocksdb.RocksDBCountersTest;
@@ -84,6 +85,7 @@
     IdTest.class,
     EdgeIdTest.class,
     IdUtilTest.class,
+    SplicingIdGeneratorTest.class,
 
     /* core */
     LocksTableTest.class,
diff --git a/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/id/SplicingIdGeneratorTest.java b/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/id/SplicingIdGeneratorTest.java
new file mode 100644
index 0000000000..03451464e6
--- /dev/null
+++ b/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/id/SplicingIdGeneratorTest.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2017 HugeGraph Authors
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with this
+ * work for additional information regarding copyright ownership. The ASF
+ * licenses this file to You under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package com.baidu.hugegraph.unit.id;
+
+import java.util.List;
+
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import com.baidu.hugegraph.backend.id.Id;
+import com.baidu.hugegraph.backend.id.IdGenerator;
+import com.baidu.hugegraph.backend.id.SplicingIdGenerator;
+import com.baidu.hugegraph.schema.PropertyKey;
+import com.baidu.hugegraph.schema.VertexLabel;
+import com.baidu.hugegraph.structure.HugeVertex;
+import com.baidu.hugegraph.testutil.Assert;
+import com.baidu.hugegraph.type.define.IdStrategy;
+import com.baidu.hugegraph.unit.FakeObjects;
+import com.google.common.collect.ImmutableList;
+
+public class SplicingIdGeneratorTest {
+
+    @Test
+    public void testGenerate() {
+        FakeObjects fakeObjects = new FakeObjects();
+        PropertyKey name = fakeObjects.newPropertyKey(IdGenerator.of(1),
+                                                      "name");
+        VertexLabel vertexLabel = fakeObjects.newVertexLabel(
+                                  IdGenerator.of(1L), "fake",
+                                  IdStrategy.PRIMARY_KEY, name.id());
+        HugeVertex vertex = Mockito.mock(HugeVertex.class);
+        Mockito.when(vertex.schemaLabel()).thenReturn(vertexLabel);
+        Mockito.when(vertex.name()).thenReturn("marko");
+        Id vid = SplicingIdGenerator.instance().generate(vertex);
+        Assert.assertEquals(IdGenerator.of("1:marko"), vid);
+    }
+
+    @Test
+    public void testConcatIds() {
+        Assert.assertEquals("a>b>c>d",
+                            SplicingIdGenerator.concat("a", "b", "c", "d"));
+        Assert.assertEquals("a>`>>c>`>",
+                            SplicingIdGenerator.concat("a", ">", "c", ">"));
+        Assert.assertEquals("a>b`>c>d",
+                            SplicingIdGenerator.concat("a", "b>c", "d"));
+    }
+
+    @Test
+    public void testSplitIds() {
+        Assert.assertArrayEquals(new String[]{"a", "b", "c", "d"},
+                                 SplicingIdGenerator.split("a>b>c>d"));
+        Assert.assertArrayEquals(new String[]{"a", ">", "c", ">"},
+                                 SplicingIdGenerator.split("a>`>>c>`>"));
+        Assert.assertArrayEquals(new String[]{"a", "b>c", "d"},
+                                 SplicingIdGenerator.split("a>b`>c>d"));
+    }
+
+    @Test
+    public void testConcatValues() {
+        Assert.assertEquals("a!1!c!d",
+                            SplicingIdGenerator.concatValues("a", 1, 'c', "d"));
+        Assert.assertEquals("a!`!!1!d",
+                            SplicingIdGenerator.concatValues("a", "!", 1, 'd'));
+        Assert.assertEquals("a!b`!c!d",
+                            SplicingIdGenerator.concatValues("a", "b!c", "d"));
+
+        List<Object> values = ImmutableList.of("a", 1, 'c', "d");
+        Assert.assertEquals("a!1!c!d",
+                            SplicingIdGenerator.concatValues(values));
+        values = ImmutableList.of("a", "!", 1, 'd');
+        Assert.assertEquals("a!`!!1!d",
+                            SplicingIdGenerator.concatValues(values));
+        values = ImmutableList.of("a", "b!c", "d");
+        Assert.assertEquals("a!b`!c!d",
+                            SplicingIdGenerator.concatValues(values));
+    }
+
+    @Test
+    public void testSplicing() {
+        Assert.assertEquals(IdGenerator.of("1:marko"),
+                            SplicingIdGenerator.splicing("1", "marko"));
+        Assert.assertEquals(IdGenerator.of("book:c:2020"),
+                            SplicingIdGenerator.splicing("book", "c", "2020"));
+    }
+
+    @Test
+    public void testParse() {
+        Assert.assertArrayEquals(new String[]{"1", "marko"},
+                                 SplicingIdGenerator.parse(
+                                 IdGenerator.of("1:marko")));
+        Assert.assertArrayEquals(new String[]{"book", "c", "2020"},
+                                 SplicingIdGenerator.parse(
+                                 IdGenerator.of("book:c:2020")));
+    }
+}