diff --git a/examples/example_tls1.py b/examples/example_tls1.py
index 397cbc83b..8879ac750 100644
--- a/examples/example_tls1.py
+++ b/examples/example_tls1.py
@@ -150,12 +150,12 @@ def main():
     # search
     search(collection, _VECTOR_FIELD_NAME, _ID_FIELD_NAME, vectors[:3])
 
-    # drop collection index
-    drop_index(collection)
-
     # release memory
     release_collection(collection)
 
+    # drop collection index
+    drop_index(collection)
+
     # drop collection
     drop_collection(_COLLECTION_NAME)
 
diff --git a/examples/example_tls2.py b/examples/example_tls2.py
index 7dc0a6eb3..211f503ab 100644
--- a/examples/example_tls2.py
+++ b/examples/example_tls2.py
@@ -152,12 +152,12 @@ def main():
     # search
     search(collection, _VECTOR_FIELD_NAME, _ID_FIELD_NAME, vectors[:3])
 
-    # drop collection index
-    drop_index(collection)
-
     # release memory
     release_collection(collection)
 
+    # drop collection index
+    drop_index(collection)
+
     # drop collection
     drop_collection(_COLLECTION_NAME)