diff --git a/packages/domain/ass_subtitle_builder.py b/packages/domain/ass_subtitle_builder.py
index b3b0b1c93..a5aaad7c1 100755
--- a/packages/domain/ass_subtitle_builder.py
+++ b/packages/domain/ass_subtitle_builder.py
@@ -24,6 +24,17 @@ TITLE_MARGIN_TOP = 120
 TITLE_MARGIN_BOTTOM = 60
 TITLE_MARGIN_SIDE = 40
 
+# 字体名称映射：前端中文字体名 → 服务器实际注册名（ffmpeg/ASS 通过注册名匹配字体）
+FONT_NAME_MAP: dict[str, str] = {
+    "思源黑体": "Noto Sans CJK SC",
+    "思源宋体": "Noto Serif CJK SC",
+    "苹方": "Noto Sans CJK SC",
+    "PingFang": "Noto Sans CJK SC",
+    "微软雅黑": "Noto Sans CJK SC",
+    "楷体": "Noto Serif CJK SC",
+    "华康俪金黑": "Noto Sans CJK SC",
+}
+
 
 # ── 颜色转换 ──────────────────────────────────────────────────────────────────
 
@@ -117,6 +128,9 @@ def build_ass_style(
     bold_val = -1 if bold else 0
     italic_val = -1 if italic else 0
 
+    # 字体名称映射：前端中文字体名 → 服务器注册名，未命中则原样使用
+    actual_font = FONT_NAME_MAP.get(font_name, font_name)
+
     # BackColour 用于阴影（BorderStyle=1 时 outline + shadow）
     back_color = primary_color
 
@@ -124,7 +138,7 @@ def build_ass_style(
     shadow_depth = shadow_offset[1] if shadow_blur > 0 else 0
 
     return (
-        f"Style: {style_name},{font_name},{font_size},{primary_color},"
+        f"Style: {style_name},{actual_font},{font_size},{primary_color},"
         f"&H000000FF,{outline_color},{back_color},"
         f"{bold_val},{italic_val},0,0,100,100,0,0,"
         f"1,{outline_width},{shadow_depth},{alignment},"
diff --git a/tests/unit/test_ass_subtitle_builder.py b/tests/unit/test_ass_subtitle_builder.py
index c45273f8d..9e0d63783 100755
--- a/tests/unit/test_ass_subtitle_builder.py
+++ b/tests/unit/test_ass_subtitle_builder.py
@@ -79,7 +79,7 @@ class TestBuildAssStyle:
     def test_minimal_style(self):
         result = build_ass_style("TestStyle")
         assert result.startswith("Style: TestStyle,")
-        assert "思源黑体" in result
+        assert "Noto Sans CJK SC" in result
         assert ",48," in result
 
     def test_custom_font_size(self):
@@ -153,6 +153,28 @@ class TestBuildAssStyle:
         assert len(parts) == 23
 
 
+    def test_font_name_mapping_siyuan(self):
+        """思源黑体 → Noto Sans CJK SC"""
+        result = build_ass_style("Test", font_name="思源黑体")
+        assert "Noto Sans CJK SC" in result
+
+    def test_font_name_mapping_apple(self):
+        """苹方 → Noto Sans CJK SC"""
+        result = build_ass_style("Test", font_name="苹方")
+        assert "Noto Sans CJK SC" in result
+
+    def test_font_name_mapping_msyh(self):
+        """微软雅黑 → Noto Sans CJK SC"""
+        result = build_ass_style("Test", font_name="微软雅黑")
+        assert "Noto Sans CJK SC" in result
+
+    def test_font_name_mapping_unknown_passthrough(self):
+        """未映射字体原样使用"""
+        result = build_ass_style("Test", font_name="CustomFont")
+        assert "CustomFont" in result
+
+
+
 # ── 文本转义 ──────────────────────────────────────────────────────────────────