diff --git a/packages/core/dumi-theme-nocobase/src/style/markdown.less b/packages/core/dumi-theme-nocobase/src/style/markdown.less
index 1b004283dc..7248b4e22b 100755
--- a/packages/core/dumi-theme-nocobase/src/style/markdown.less
+++ b/packages/core/dumi-theme-nocobase/src/style/markdown.less
@@ -219,7 +219,7 @@
   // images
   img {
     max-width: 1000px;
-    @media only screen and (max-width: 1400px) {
+    @media only screen and (max-width: 1550px) {
       max-width: 100%;
     }
   }