diff --git a/sdk-core/src/main/java/io/milvus/orm/iterator/QueryIterator.java b/sdk-core/src/main/java/io/milvus/orm/iterator/QueryIterator.java
index 3fba0e21c..fd85a6bf2 100644
--- a/sdk-core/src/main/java/io/milvus/orm/iterator/QueryIterator.java
+++ b/sdk-core/src/main/java/io/milvus/orm/iterator/QueryIterator.java
@@ -199,7 +199,7 @@ private String setupNextExpr() {
         if (StringUtils.isEmpty(currentExpr)) {
             return filteredPKStr;
         }
-        return " ( " + currentExpr + " ) " + " and " + filteredPKStr;
+        return filteredPKStr + " and ( " + currentExpr + " )";
     }
 
     private boolean isResSufficient(List<QueryResultsWrapper.RowRecord> ret) {