diff --git a/milvus/Data.ts b/milvus/Data.ts
index b568ab29..c5a347f1 100644
--- a/milvus/Data.ts
+++ b/milvus/Data.ts
@@ -335,6 +335,16 @@ export class Data extends Client {
       throw new Error(ERROR_REASONS.SEARCH_DIM_NOT_MATCH);
     }
 
+    const round_decimal = data.search_params.round_decimal;
+    if (
+      round_decimal !== undefined &&
+      (!Number.isInteger(round_decimal) ||
+        round_decimal < -1 ||
+        round_decimal > 6)
+    ) {
+      throw new Error(ERROR_REASONS.SEARCH_ROUND_DECIMAL_NOT_VALID);
+    }
+
     // when data type is bytes , we need use protobufjs to transform data to buffer bytes.
     const PlaceholderGroup = root.lookupType(
       'milvus.proto.common.PlaceholderGroup'
@@ -377,7 +387,6 @@ export class Data extends Client {
      *  And if Milvus return like 3.142, Node will add more number after this like 3.142000047683716.
      *  So the score need to slice by round_decimal
      */
-    const round_decimal = data.search_params.round_decimal;
     if (promise.results) {
       /**
        *  fields_data:  what you pass in output_fields, only support non vector fields.
diff --git a/milvus/const/ErrorReason.ts b/milvus/const/ErrorReason.ts
index 0cb04ef0..d52758aa 100644
--- a/milvus/const/ErrorReason.ts
+++ b/milvus/const/ErrorReason.ts
@@ -20,6 +20,7 @@ export enum ERROR_REASONS {
   SEARCH_NOT_FIND_VECTOR_FIELD = 'Your anns_field cannot find in this collection.',
   SEARCH_DIM_NOT_MATCH = 'Your vector dimension is not match your anns_field dimension',
   SEARCH_PARAMS_IS_REQUIRED = 'search_params must contains anns_field, metric_type, topk and params.',
+  SEARCH_ROUND_DECIMAL_NOT_VALID = 'round_decimal should be an integer greater than -2 and less than 7',
 
   DELETE_PARAMS_CHECK = 'Collection name and expr is required.',
 
diff --git a/test/Data.spec.ts b/test/Data.spec.ts
index 518f5d47..b7ff341c 100644
--- a/test/Data.spec.ts
+++ b/test/Data.spec.ts
@@ -202,6 +202,27 @@ describe('Data.ts Test', () => {
     }
   });
 
+  it('Expr Search should throw SEARCH_ROUND_DECIMAL_NOT_VALID', async () => {
+    try {
+      await milvusClient.dataManager.search({
+        collection_name: COLLECTION_NAME,
+        expr: '',
+        vectors: [[1, 2, 3, 4]],
+        search_params: {
+          anns_field: VECTOR_FIELD_NAME,
+          topk: '4',
+          metric_type: 'L2',
+          params: JSON.stringify({ nprobe: 1024 }),
+          round_decimal: 7,
+        },
+        output_fields: ['age'],
+        vector_type: DataType.FloatVector,
+      });
+    } catch (err) {
+      expect(err.message).toEqual(ERROR_REASONS.SEARCH_ROUND_DECIMAL_NOT_VALID);
+    }
+  });
+
   it('Query ', async () => {
     await milvusClient.dataManager.deleteEntities({
       collection_name: COLLECTION_NAME,