diff --git a/Dockerfile b/Dockerfile
index fb91297..4a3efcd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,12 @@
 # 备选镜像源前缀：docker.1ms.run / dockerpull.com / docker.xuanyuan.me
 FROM docker.m.daocloud.io/python:3.13-slim
 
+# 国内镜像源（清华）
+ENV PIP_INDEX_URL=https://pypi.tuna.tsinghua.edu.cn/simple
+ENV PIP_TRUSTED_HOST=pypi.tuna.tsinghua.edu.cn
+ENV UV_INDEX_URL=https://pypi.tuna.tsinghua.edu.cn/simple
+ENV UV_TRUSTED_HOST=pypi.tuna.tsinghua.edu.cn
+
 # 环境变量：非交互 + 路径配置
 ENV DEBIAN_FRONTEND=noninteractive \
     LANG=C.UTF-8 \
diff --git a/src/pyflowx/cli/pdftool.py b/src/pyflowx/cli/pdftool.py
index 52476f1..d850c8b 100644
--- a/src/pyflowx/cli/pdftool.py
+++ b/src/pyflowx/cli/pdftool.py
@@ -286,7 +286,8 @@ def pdf_ocr(input_path: Path, output_path: Path, lang: str = "chi_sim+eng") -> N
         new_page = new_doc.new_page(width=page.rect.width, height=page.rect.height)
         new_page.insert_image(new_page.rect, pixmap=pix)
         text_rect = fitz.Rect(0, 0, page.rect.width, page.rect.height)
-        new_page.insert_textbox(text_rect, ocr_text)
+        # pyrefly: ignore [bad-argument-type]
+        new_page.insert_textbox(text_rect, ocr_text, fontname="china-ss", fontsize=11)
 
     output_path.parent.mkdir(parents=True, exist_ok=True)
     new_doc.save(str(output_path))