diff --git a/handlers/render_video.py b/handlers/render_video.py
index 9f9982c..b4f0622 100644
--- a/handlers/render_video.py
+++ b/handlers/render_video.py
@@ -123,9 +123,13 @@ class RenderSegmentVideoHandler(BaseHandler):
             overlay_file = None
             if render_spec.overlay_url:
                 # 根据 URL 后缀确定文件扩展名
-                ext = '.png'
-                if render_spec.overlay_url.lower().endswith('.jpg') or render_spec.overlay_url.lower().endswith('.jpeg'):
+                url_lower = render_spec.overlay_url.lower()
+                if url_lower.endswith('.jpg') or url_lower.endswith('.jpeg'):
                     ext = '.jpg'
+                elif url_lower.endswith('.mov'):
+                    ext = '.mov'
+                else:
+                    ext = '.png'  # 默认
                 overlay_file = os.path.join(work_dir, f'overlay{ext}')
                 if not self.download_file(render_spec.overlay_url, overlay_file):
                     logger.warning(f"[task:{task.task_id}] Failed to download overlay, continuing without it")
@@ -332,7 +336,7 @@ class RenderSegmentVideoHandler(BaseHandler):
             render_spec=render_spec,
             output_spec=output_spec,
             lut_file=lut_file,
-            has_overlay=overlay_file is not None,
+            overlay_file=overlay_file,
             overlap_head_ms=overlap_head_ms,
             overlap_tail_ms=overlap_tail_ms
         )
@@ -376,7 +380,7 @@ class RenderSegmentVideoHandler(BaseHandler):
         render_spec: RenderSpec,
         output_spec: OutputSpec,
         lut_file: Optional[str] = None,
-        has_overlay: bool = False,
+        overlay_file: Optional[str] = None,
         overlap_head_ms: int = 0,
         overlap_tail_ms: int = 0
     ) -> str:
@@ -387,7 +391,7 @@ class RenderSegmentVideoHandler(BaseHandler):
             render_spec: 渲染规格
             output_spec: 输出规格
             lut_file: LUT 文件路径
-            has_overlay: 是否有叠加层
+            overlay_file: 叠加层文件路径（支持图片 png/jpg 和视频 mov）
             overlap_head_ms: 头部 overlap 时长（毫秒）
             overlap_tail_ms: 尾部 overlap 时长（毫秒）
 
@@ -399,6 +403,10 @@ class RenderSegmentVideoHandler(BaseHandler):
         height = output_spec.height
         fps = output_spec.fps
 
+        # 判断 overlay 类型
+        has_overlay = overlay_file is not None
+        is_video_overlay = has_overlay and overlay_file.lower().endswith('.mov')
+
         # 解析 effects
         effects = render_spec.get_effects()
         has_camera_shot = any(e.effect_type == 'cameraShot' for e in effects)
@@ -459,6 +467,7 @@ class RenderSegmentVideoHandler(BaseHandler):
                 effects=effects,
                 fps=fps,
                 has_overlay=has_overlay,
+                is_video_overlay=is_video_overlay,
                 overlap_head_ms=overlap_head_ms,
                 overlap_tail_ms=overlap_tail_ms,
                 use_hwdownload=bool(hwaccel_prefix)
@@ -483,7 +492,10 @@ class RenderSegmentVideoHandler(BaseHandler):
         if has_overlay:
             # 使用 filter_complex 格式
             base_filters = ','.join(filters) if filters else 'copy'
-            return f"[0:v]{base_filters}[base];[base][1:v]overlay=0:0"
+            # 视频 overlay 使用 eof_action=pass（结束后消失），图片 overlay 使用默认行为（保持显示）
+            overlay_params = 'eof_action=pass' if is_video_overlay else ''
+            overlay_filter = f"overlay=0:0:{overlay_params}" if overlay_params else 'overlay=0:0'
+            return f"[0:v]{base_filters}[base];[base][1:v]{overlay_filter}"
         else:
             return ','.join(filters) if filters else ''
 
@@ -493,6 +505,7 @@ class RenderSegmentVideoHandler(BaseHandler):
         effects: List[Effect],
         fps: int,
         has_overlay: bool = False,
+        is_video_overlay: bool = False,
         overlap_head_ms: int = 0,
         overlap_tail_ms: int = 0,
         use_hwdownload: bool = False
@@ -507,6 +520,7 @@ class RenderSegmentVideoHandler(BaseHandler):
             effects: 特效列表
             fps: 帧率
             has_overlay: 是否有叠加层
+            is_video_overlay: 叠加层是否为视频格式（如 .mov）
             overlap_head_ms: 头部 overlap 时长
             overlap_tail_ms: 尾部 overlap 时长
             use_hwdownload: 是否使用了硬件加速解码（已在 base_filters 中包含 hwdownload）
@@ -587,7 +601,10 @@ class RenderSegmentVideoHandler(BaseHandler):
         # 最终输出
         if has_overlay:
             # 叠加层处理
-            filter_parts.append(f"{current_output}[1:v]overlay=0:0")
+            # 视频 overlay 使用 eof_action=pass（结束后消失），图片 overlay 使用默认行为（保持显示）
+            overlay_params = 'eof_action=pass' if is_video_overlay else ''
+            overlay_filter = f"overlay=0:0:{overlay_params}" if overlay_params else 'overlay=0:0'
+            filter_parts.append(f"{current_output}[1:v]{overlay_filter}")
         else:
             # 移除最后一个标签，直接输出
             # 将最后一个滤镜的输出标签替换为空（直接输出）