diff --git a/devel/0157.md b/devel/0157.md
new file mode 100644
index 0000000000..8bc884fa76
--- /dev/null
+++ b/devel/0157.md
@@ -0,0 +1,41 @@
+# [0157] 修复"automatic"渲染模式下文字缺失问题
+
+## 1 相关文档
+- [dddd.md](dddd.md) - 任务文档模板
+
+## 2 任务相关的代码文件
+- `src/Edit/Interface/edit_repaint.cpp`
+- `src/Graphics/Renderer/renderer.cpp`
+- `src/Graphics/Renderer/renderer.hpp`
+
+## 3 如何测试
+
+### 3.1 非确定性测试（文档验证）
+编译并运行程序，任意打开一个有文字的文档，在页面渲染下拉框选择"屏幕"，然后将光标置于英文单词中间，观察光标消失时字体渲染是否完整
+
+## 4 如何提交
+
+```bash
+git add devel/0157.md
+git commit -m "[0157] 更新任务文档"
+git add src/Edit/Interface/edit_repaint.cpp src/Graphics/Renderer/renderer.cpp src/Graphics/Renderer/renderer.hpp
+git commit -m "[0157] 修复automatic渲染模式下文字缺失问题"
+git push
+```
+
+## 5 What
+
+1. Render基类新增`void end_text()`接口
+2. 在`edit_interface_rep::draw_surround()`函数中，针对所有渲染模式，强制调用`end_text`，确保PDF相关渲染器中缓冲的文字写入流被提交刷新（对QT渲染器无影响）
+
+## 6 Why
+当 `page-medium` 设置为 `automatic` 时，页面渲染显示为"屏幕"，光标附近的文字渲染会部分消失
+
+## 7 How
+PDF相关渲染器要求BT、ET操作配对，才能完成文字写入
+光标闪烁的渲染器调用序列为：
+1. 清空光标所在矩形区域
+2. 重绘光标所在文本区域的文字（BT操作）
+3. 调用`edit_interface_rep::draw_surround()`函数处理页面周围
+   - 非automatic时，会调用clear，间接产生ET操作
+   - automatic直接return，无ET操作，文字序列停留缓冲区，未渲染
\ No newline at end of file
diff --git a/src/Edit/Interface/edit_repaint.cpp b/src/Edit/Interface/edit_repaint.cpp
index 1f2e914fa0..99db313a78 100644
--- a/src/Edit/Interface/edit_repaint.cpp
+++ b/src/Edit/Interface/edit_repaint.cpp
@@ -136,6 +136,7 @@ void
 edit_interface_rep::draw_surround (renderer ren, rectangle r) {
   ren->set_background (tm_background);
   string medium= get_init_string (PAGE_MEDIUM);
+  ren->end_text ();
   if (medium == "automatic") return;
   if (medium == "beamer" && full_screen) return;
   ren->clear (r->x1, r->y1, max (r->x1, eb->x1), r->y2);
diff --git a/src/Graphics/Renderer/renderer.cpp b/src/Graphics/Renderer/renderer.cpp
index 1abcdcba23..35aa9861bf 100644
--- a/src/Graphics/Renderer/renderer.cpp
+++ b/src/Graphics/Renderer/renderer.cpp
@@ -536,6 +536,11 @@ renderer_rep::draw_emoji (int char_code, font_glyphs fn, SI x, SI y) {
   return true;
 }
 
+void
+renderer_rep::end_text () {
+  return;
+}
+
 /******************************************************************************
  * Drawing selections using alpha transparency
  ******************************************************************************/
diff --git a/src/Graphics/Renderer/renderer.hpp b/src/Graphics/Renderer/renderer.hpp
index b66051c4f7..4fe5bd8dea 100644
--- a/src/Graphics/Renderer/renderer.hpp
+++ b/src/Graphics/Renderer/renderer.hpp
@@ -118,6 +118,7 @@ class renderer_rep {
   virtual void draw_selection (rectangles rs);
   virtual void draw_curve (curve c, bool filled= false);
   virtual bool support_native_curve (curve c);
+  virtual void end_text ();
   bool         draw_emoji (int char_code, font_glyphs fn, SI x, SI y);
 
   /* shadowing and copying rectangular regions across renderers */