diff --git a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/serializer/BinarySerializer.java b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/serializer/BinarySerializer.java
index 0a9ce85341..e195033f3f 100644
--- a/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/serializer/BinarySerializer.java
+++ b/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/serializer/BinarySerializer.java
@@ -427,24 +427,24 @@ public BackendEntry writeVertex(HugeVertex vertex) {
 
     @Override
     public BackendEntry writeOlapVertex(HugeVertex vertex) {
+        // TODO: adapt to hstore (merge olap table)
+        BinaryBackendEntry entry = newBackendEntry(HugeType.OLAP, vertex.id());
         BytesBuffer buffer = BytesBuffer.allocate(8 + 16);
 
-        HugeProperty<?> hugeProperty = vertex.getProperties().iterator().next();
-        PropertyKey propertyKey = hugeProperty.propertyKey();
+        Collection<HugeProperty<?>> properties = vertex.getProperties();
+        if (properties.size() != 1) {
+            E.checkArgument(false,
+                "Expect 1 property for olap vertex, but got %s",
+                properties.size());
+        }
+        HugeProperty<?> property = properties.iterator().next();
+        PropertyKey propertyKey = property.propertyKey();
         buffer.writeVInt(SchemaElement.schemaId(propertyKey.id()));
-        buffer.writeProperty(propertyKey, hugeProperty.value());
-
-        // olap表合并, key为 {property_key_id}{vertex_id}
-        BytesBuffer bufferName =
-            BytesBuffer.allocate(1 + propertyKey.id().length() + 1 + vertex.id().length());
-        bufferName.writeId(propertyKey.id());
-        byte[] idBytes = bufferName.writeId(vertex.id()).bytes();
+        buffer.writeProperty(propertyKey, property.value());
 
         // Fill column
-        BinaryBackendEntry entry = new BinaryBackendEntry(HugeType.OLAP,
-            new BinaryId(idBytes, vertex.id()));
-
-        byte[] name = entry.id().asBytes();
+        byte[] name = this.keyWithIdPrefix ?
+            entry.id().asBytes() : BytesBuffer.BYTES_EMPTY;
         entry.column(name, buffer.bytes());
         entry.subId(propertyKey.id());
         entry.olap(true);
diff --git a/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/VertexCoreTest.java b/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/VertexCoreTest.java
index 015f3e2772..f6ed6b3d07 100644
--- a/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/VertexCoreTest.java
+++ b/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/VertexCoreTest.java
@@ -76,6 +76,7 @@
 import org.apache.tinkerpop.gremlin.structure.Vertex;
 import org.apache.tinkerpop.gremlin.structure.util.CloseableIterator;
 import org.apache.tinkerpop.gremlin.util.iterator.IteratorUtils;
+import org.junit.After;
 import org.junit.Assume;
 import org.junit.Before;
 import org.junit.Test;
@@ -156,6 +157,12 @@ public void initSchema() {
               .create();
     }
 
+    @After
+    public void resetGraphMode() {
+        // In OLAP-related tests, if an error occurs midway, the graph mode will not be reset.
+        graph().readMode(GraphReadMode.OLTP_ONLY);
+    }
+
     protected void initPersonIndex(boolean indexCity) {
         SchemaManager schema = graph().schema();