diff --git a/doc/DESIGN_DOC.md b/doc/DESIGN_DOC.md
index 1865e7523bd0d1b51d5934df2819c6f06da5470f..b8848e19198b1f6c440daa6e0e92226d84a861e3 100644
--- a/doc/DESIGN_DOC.md
+++ b/doc/DESIGN_DOC.md
@@ -121,7 +121,7 @@ Paddle Serving的核心执行引擎是一个有向无环图，图中的每个节
 
 <p align="center">
     <br>
-<img src='cube.png' width = "450" height = "250">
+<img src='cube_eng.png' width = "450" height = "230">
     <br>
 <p>