diff --git a/modules/video/multiple_object_tracking/fairmot_dla34/README.md b/modules/video/multiple_object_tracking/fairmot_dla34/README.md
index 22074a04ffedc228290d7b4de13bb3d6e651bf25..3ff8bd396a3bc60764241701856dfa20feb59459 100644
--- a/modules/video/multiple_object_tracking/fairmot_dla34/README.md
+++ b/modules/video/multiple_object_tracking/fairmot_dla34/README.md
@@ -53,7 +53,7 @@
     ```
   - 通过命令行方式实现多目标追踪模型的调用，更多请见 [PaddleHub命令行指令](../../../../docs/docs_ch/tutorial/cmd_usage.rst)
 
-- ### 2、代码示例
+- ### 2、预测代码示例
 
   - ```python
     import paddlehub as hub
diff --git a/modules/video/multiple_object_tracking/fairmot_dla34/tracker.py b/modules/video/multiple_object_tracking/fairmot_dla34/tracker.py
index 5f91b1227595cde3bb1ed7f29dbeea039da48830..f641527ce94c8014db1afc0c5418bf6a278c352e 100644
--- a/modules/video/multiple_object_tracking/fairmot_dla34/tracker.py
+++ b/modules/video/multiple_object_tracking/fairmot_dla34/tracker.py
@@ -41,7 +41,8 @@ class StreamTracker(object):
         self.optimizer = None
 
         # build model
-        self.model = create(cfg.architecture)
+        with paddle.no_grad():
+            self.model = create(cfg.architecture)
 
         self.status = {}
         self.start_epoch = 0
diff --git a/modules/video/multiple_object_tracking/jde_darknet53/README.md b/modules/video/multiple_object_tracking/jde_darknet53/README.md
index 19746962688e10d2eaf7a3503e2e53e03462fc7a..87e0755cce6c439e4f0ebb04c6ef5e3f740d433a 100644
--- a/modules/video/multiple_object_tracking/jde_darknet53/README.md
+++ b/modules/video/multiple_object_tracking/jde_darknet53/README.md
@@ -55,7 +55,7 @@
     ```
   - 通过命令行方式实现多目标追踪模型的调用，更多请见 [PaddleHub命令行指令](../../../../docs/docs_ch/tutorial/cmd_usage.rst)
 
-- ### 2、代码示例
+- ### 2、预测代码示例
 
   - ```python
     import paddlehub as hub