diff --git a/test/grpc/Data.spec.ts b/test/grpc/Data.spec.ts
index ef264cf7..061d819f 100644
--- a/test/grpc/Data.spec.ts
+++ b/test/grpc/Data.spec.ts
@@ -21,6 +21,7 @@ const milvusClient = new MilvusClient({
   address: IP,
 });
 const COLLECTION_NAME = GENERATE_NAME();
+const VARCHAR_ID_COLLECTION_NAME = GENERATE_NAME();
 const dbParam = {
   db_name: 'Data',
 };
@@ -30,6 +31,14 @@ const createCollectionParams = genCollectionParams({
   vectorType: [DataType.FloatVector],
   autoID: false,
 });
+const createCollectionParamsVarcharID = genCollectionParams({
+  collectionName: VARCHAR_ID_COLLECTION_NAME,
+  dim: [4],
+  vectorType: [DataType.FloatVector],
+  autoID: false,
+  idType: DataType.VarChar,
+});
+
 const INDEX_NAME = 'collection_index';
 const PARTITION_NAME = GENERATE_NAME('partition');
 
@@ -40,6 +49,7 @@ describe(`Data.API`, () => {
     await milvusClient.use(dbParam);
     // create collection
     await milvusClient.createCollection(createCollectionParams);
+    await milvusClient.createCollection(createCollectionParamsVarcharID);
     // create partition
     await milvusClient.createPartition({
       collection_name: COLLECTION_NAME,
@@ -51,10 +61,17 @@ describe(`Data.API`, () => {
       collection_name: COLLECTION_NAME,
       data: generateInsertData(createCollectionParams.fields, 1024),
     });
+    await milvusClient.insert({
+      collection_name: VARCHAR_ID_COLLECTION_NAME,
+      data: generateInsertData(createCollectionParamsVarcharID.fields, 1024),
+    });
 
     await milvusClient.flush({
       collection_names: [COLLECTION_NAME],
     });
+    await milvusClient.flush({
+      collection_names: [VARCHAR_ID_COLLECTION_NAME],
+    });
 
     // create index
     await milvusClient.createIndex({
@@ -65,16 +82,30 @@ describe(`Data.API`, () => {
       metric_type: 'L2',
       params: { M: 4, efConstruction: 8 },
     });
+    await milvusClient.createIndex({
+      index_name: INDEX_NAME,
+      collection_name: VARCHAR_ID_COLLECTION_NAME,
+      field_name: VECTOR_FIELD_NAME,
+      index_type: IndexType.HNSW,
+      metric_type: 'L2',
+      params: { M: 4, efConstruction: 8 },
+    });
     // load
     await milvusClient.loadCollectionSync({
       collection_name: COLLECTION_NAME,
     });
+    await milvusClient.loadCollectionSync({
+      collection_name: VARCHAR_ID_COLLECTION_NAME,
+    });
   });
 
   afterAll(async () => {
     await milvusClient.dropCollection({
       collection_name: COLLECTION_NAME,
     });
+    await milvusClient.dropCollection({
+      collection_name: VARCHAR_ID_COLLECTION_NAME,
+    });
     await milvusClient.dropDatabase(dbParam);
   });
 
@@ -571,6 +602,22 @@ describe(`Data.API`, () => {
     });
 
     expect(res.status.error_code).toEqual(ErrorCode.SUCCESS);
+
+    // query varchar ids collection
+    const query = await milvusClient.query({
+      collection_name: VARCHAR_ID_COLLECTION_NAME,
+      expr: 'id != ""',
+    });
+
+    // get query ids
+    const ids = query.data.map(d => d.id);
+
+    const res2 = await milvusClient.delete({
+      collection_name: VARCHAR_ID_COLLECTION_NAME,
+      ids: ids,
+    });
+
+    expect(res2.status.error_code).toEqual(ErrorCode.SUCCESS);
   });
 
   it(`delete by filter should success`, async () => {
diff --git a/test/tools/collection.ts b/test/tools/collection.ts
index 46b75bc3..7740c71b 100644
--- a/test/tools/collection.ts
+++ b/test/tools/collection.ts
@@ -40,6 +40,7 @@ export const genCollectionParams = (data: {
   numPartitions?: number;
   enableDynamic?: boolean;
   maxCapacity?: number;
+  idType?: DataType;
 }) => {
   const {
     collectionName,
@@ -51,6 +52,7 @@ export const genCollectionParams = (data: {
     numPartitions,
     enableDynamic = false,
     maxCapacity,
+    idType = DataType.Int64,
   } = data;
 
   const vectorFields = vectorType.map((type, i) => {
@@ -67,18 +69,25 @@ export const genCollectionParams = (data: {
     return res;
   });
 
+  const idField: any = {
+    name: 'id',
+    description: 'ID field',
+    data_type: idType,
+    is_primary_key: true,
+    autoID,
+  };
+
+  // if idType is varchar, add max length
+  if (idType === DataType.VarChar) {
+    idField.max_length = MAX_LENGTH;
+  }
+
   const params: any = {
     collection_name: collectionName,
     consistency_level: ConsistencyLevelEnum.Strong,
     fields: [
       ...vectorFields,
-      {
-        name: 'id',
-        description: 'ID field',
-        data_type: DataType.Int64,
-        is_primary_key: true,
-        autoID,
-      },
+      idField,
       {
         name: 'int64',
         description: 'int64 field',