diff --git a/deploy/python/build_gallery.py b/deploy/python/build_gallery.py
index 439e9ab0af13d330d07b821090fdab252671bab0..63c411c64ead923cf77d3ed1b870642c58be9d92 100644
--- a/deploy/python/build_gallery.py
+++ b/deploy/python/build_gallery.py
@@ -50,8 +50,8 @@ class GalleryBuilder(object):
         self.config = config
         self.rec_predictor = RecPredictor(config)
         assert 'IndexProcess' in config.keys(), "Index config not found ... "
-        self.build(config['IndexProcess'])
         self.android_demo = config["Global"].get("android_demo", False)
+        self.build(config['IndexProcess'])
 
     def build(self, config):
         '''
@@ -78,7 +78,8 @@ class GalleryBuilder(object):
         index, ids = None, None
         if operation_method in ["remove", "append"]:
             # if remove or append, load vector.index and id_map.pkl
-            index, ids = self._load_index()
+            index, ids = self._load_index(config)
+            index_method = config.get("index_method", "HNSW32")
         else:
             index_method, index, ids = self._create_index(config)
         if index_method == "HNSW32":
@@ -87,7 +88,7 @@ class GalleryBuilder(object):
 
         if operation_method != "remove":
             # calculate id for new data
-            index, ids = self._add_gallery(index, ids, gallery_features, gallery_docs)
+            index, ids = self._add_gallery(index, ids, gallery_features, gallery_docs, config, operation_method)
         else:
             if index_method == "HNSW32":
                 raise RuntimeError(
@@ -104,14 +105,11 @@ class GalleryBuilder(object):
             os.makedirs(config["index_dir"], exist_ok=True)
         #build index
         index = faiss.IndexFlatIP(config["embedding_size"])
-        ids = {}
-
-        # calculate id for new data
-        ids_now = (
-            np.arange(0, len(gallery_images))).astype(np.int64)
-
         index.add(gallery_features)
 
+        # calculate id for data
+        ids_now = (np.arange(0, len(gallery_docs))).astype(np.int64)
+        ids = {}
         for i, d in zip(list(ids_now), gallery_docs):
             ids[i] = d
         self._save_gallery(config, index, ids)
@@ -197,7 +195,7 @@ class GalleryBuilder(object):
         ids = {}
         return index_method, index, ids
 
-    def _add_gallery(self, index, ids, gallery_features, gallery_docs):
+    def _add_gallery(self, index, ids, gallery_features, gallery_docs, config, operation_method):
         start_id = max(ids.keys()) + 1 if ids else 0
         ids_now = (
             np.arange(0, len(gallery_docs)) + start_id).astype(np.int64)
@@ -216,7 +214,7 @@ class GalleryBuilder(object):
             ids[i] = d
         return index, ids
 
-    def _rm_id_in_galllery(self, index, ids, gallery_docs)
+    def _rm_id_in_galllery(self, index, ids, gallery_docs):
         remove_ids = list(
             filter(lambda k: ids.get(k) in gallery_docs, ids.keys()))
         remove_ids = np.asarray(remove_ids)