diff --git a/tools/program.py b/tools/program.py
index 6d8b9937bff7e70f018b069467525669e7001aae..af8ceabe5a88380458ad84f21abcf0c794debca0 100755
--- a/tools/program.py
+++ b/tools/program.py
@@ -89,13 +89,13 @@ def load_config(file_path):
     merge_config(default_config)
     _, ext = os.path.splitext(file_path)
     assert ext in ['.yml', '.yaml'], "only support yaml files for now"
-    merge_config(yaml.load(open(file_path), Loader=yaml.Loader))
+    merge_config(yaml.load(open(file_path, 'rb'), Loader=yaml.Loader))
     assert "reader_yml" in global_config['Global'],\
         "absence reader_yml in global"
     reader_file_path = global_config['Global']['reader_yml']
     _, ext = os.path.splitext(reader_file_path)
     assert ext in ['.yml', '.yaml'], "only support yaml files for reader"
-    merge_config(yaml.load(open(reader_file_path), Loader=yaml.Loader))
+    merge_config(yaml.load(open(reader_file_path, 'rb'), Loader=yaml.Loader))
     return global_config