diff --git a/devel/204_30.md b/devel/204_30.md
index 847cee79bd..2e72abd0f2 100644
--- a/devel/204_30.md
+++ b/devel/204_30.md
@@ -23,6 +23,11 @@
 3. 触发一次保存
 4. 使用 vscode 或其他纯文本编辑器，打开刚刚保存的 tmu 文档，查看 tmu 头部的 style 块，不应该携带 dark 字样
 
+测试项五：导出PDF只允许浅色
+1. 进入软件的深色主题
+2. 在深色主题下，打开任意 tmu 文件，文档背景色应该是深色
+3. 点击 文件->导出->PDF，或者 文件->预览，我们最终看到的PDF都应该是将软件调整为浅色主题打开tmu文件看到的渲染效果
+
 ## 2026/03/31 文档主题跟随软件主题，保存时不保留dark
 
 ### What
diff --git a/src/Edit/Editor/edit_main.cpp b/src/Edit/Editor/edit_main.cpp
index 967d706af2..1e3a91bd92 100644
--- a/src/Edit/Editor/edit_main.cpp
+++ b/src/Edit/Editor/edit_main.cpp
@@ -202,6 +202,16 @@ edit_main_rep::print_doc (url name, bool conform, int first, int last) {
   if (conform && (medium != "paper")) conform= false;
   // FIXME: better command for conform printing
 
+  // Save current style and remove dark theme for printing
+  tree saved_style= the_style;
+  if (the_style == "dark") the_style= tree (TUPLE);
+  else if (is_func (the_style, TUPLE)) {
+    tree style (TUPLE);
+    for (int i= 0; i < N (the_style); ++i)
+      if (the_style[i] != "dark") style << the_style[i];
+    the_style= style;
+  }
+
   typeset_preamble ();
   // FIXME: when printing several files via aux buffers,
   // it seems that the style can be corrupted.  Why?
@@ -281,6 +291,9 @@ edit_main_rep::print_doc (url name, bool conform, int first, int last) {
   }
   tm_delete (ren);
   delete_typesetter (ttt);
+
+  // Restore original style
+  the_style= saved_style;
 }
 
 void