diff --git a/server-rs/crates/api-server/src/editor_project.rs b/server-rs/crates/api-server/src/editor_project.rs
index b4ba2bc9b..c4576087b 100644
--- a/server-rs/crates/api-server/src/editor_project.rs
+++ b/server-rs/crates/api-server/src/editor_project.rs
@@ -2227,14 +2227,16 @@ async fn remove_editor_generated_screen_background_with_bgfilter(
     audit: &crate::external_api_audit::ExternalApiAuditContext,
 ) -> Result<DownloadedOpenAiImage, AppError> {
     if let Some(remaining) = editor_bgfilter_circuit_open_remaining(state) {
+        // 熔断打开只跳过 BgFilter 调用本身，仍要走阿里云兜底；绝不能在 cooldown 内直接退化到
+        // 低质量本地扣色，否则整段冷却期从「双供应商降级」退化成单一本地键色扣除。
         tracing::warn!(
             provider = "bgfilter",
             screen_color = screen_color.hex,
             seg_model,
             cooldown_ms = remaining.as_millis() as u64,
-            "editor_bgfilter_circuit_open_fallback_to_local_screen_background_removal"
+            "editor_bgfilter_circuit_open_fallback_to_aliyun_matting"
         );
-        return remove_editor_generated_green_screen_background(image, screen_color);
+        return fallback_editor_screen_background_removal(state, image, screen_color, audit).await;
     }
 
     match request_editor_generated_screen_background_with_bgfilter(
@@ -2273,39 +2275,50 @@ async fn remove_editor_generated_screen_background_with_bgfilter(
                 crate::external_api_audit::matting_failure_audit_raw_excerpt(&error),
             )
             .await;
-            match crate::aliyun_matting::segment_image_with_aliyun_matting(
+            fallback_editor_screen_background_removal(state, image, screen_color, audit).await
+        }
+    }
+}
+
+/// BgFilter 不可用（熔断打开或调用失败）时的统一兜底链：先阿里云通用抠图，失败再退本地键色扣除。
+/// 熔断打开路径与 BgFilter 调用失败路径共用此链，确保 cooldown 内仍是「阿里云 → 本地」而非直接本地。
+async fn fallback_editor_screen_background_removal(
+    state: &AppState,
+    image: &DownloadedOpenAiImage,
+    screen_color: EditorScreenBackgroundColor,
+    audit: &crate::external_api_audit::ExternalApiAuditContext,
+) -> Result<DownloadedOpenAiImage, AppError> {
+    match crate::aliyun_matting::segment_image_with_aliyun_matting(
+        state,
+        image,
+        "editor-screen-background",
+    )
+    .await
+    {
+        Ok(image) => Ok(image),
+        Err(error) => {
+            tracing::warn!(
+                provider = "aliyun-matting",
+                screen_color = screen_color.hex,
+                error = %error,
+                error_details = ?error.details(),
+                "editor_aliyun_matting_fallback_to_local_screen_background_removal"
+            );
+            crate::external_api_audit::record_matting_external_api_failure(
                 state,
-                image,
-                "editor-screen-background",
+                audit,
+                "aliyun-matting",
+                state.config.aliyun_matting_endpoint.clone(),
+                "editor-screen-background-removal",
+                "aliyun_segment",
+                crate::external_api_audit::matting_failure_audit_status_code(&error),
+                crate::external_api_audit::matting_failure_audit_timeout(&error),
+                crate::external_api_audit::matting_failure_audit_latency_ms(&error),
+                error.message().to_string(),
+                crate::external_api_audit::matting_failure_audit_raw_excerpt(&error),
             )
-            .await
-            {
-                Ok(image) => Ok(image),
-                Err(error) => {
-                    tracing::warn!(
-                        provider = "aliyun-matting",
-                        screen_color = screen_color.hex,
-                        error = %error,
-                        error_details = ?error.details(),
-                        "editor_aliyun_matting_fallback_to_local_screen_background_removal"
-                    );
-                    crate::external_api_audit::record_matting_external_api_failure(
-                        state,
-                        audit,
-                        "aliyun-matting",
-                        state.config.aliyun_matting_endpoint.clone(),
-                        "editor-screen-background-removal",
-                        "aliyun_segment",
-                        crate::external_api_audit::matting_failure_audit_status_code(&error),
-                        crate::external_api_audit::matting_failure_audit_timeout(&error),
-                        crate::external_api_audit::matting_failure_audit_latency_ms(&error),
-                        error.message().to_string(),
-                        crate::external_api_audit::matting_failure_audit_raw_excerpt(&error),
-                    )
-                    .await;
-                    remove_editor_generated_green_screen_background(image, screen_color)
-                }
-            }
+            .await;
+            remove_editor_generated_green_screen_background(image, screen_color)
         }
     }
 }
@@ -7573,12 +7586,25 @@ mod tests {
                 "remove_editor_generated_screen_background_with_bgfilter",
             ],
         );
-        assert_function_contains(
+        assert_function_contains_in_order(
             source,
             "async fn remove_editor_generated_screen_background_with_bgfilter",
+            "async fn fallback_editor_screen_background_removal",
+            &[
+                // 熔断打开分支必须先委派统一兜底链（阿里云→本地），不能直接退化本地扣色；
+                // BgFilter 调用失败分支同样走该兜底链。
+                "editor_bgfilter_circuit_open_remaining",
+                "fallback_editor_screen_background_removal",
+                "request_editor_generated_screen_background_with_bgfilter",
+                "fallback_editor_screen_background_removal",
+            ],
+        );
+        assert_function_contains_in_order(
+            source,
+            "async fn fallback_editor_screen_background_removal",
             "async fn request_editor_generated_screen_background_with_bgfilter",
             &[
-                "request_editor_generated_screen_background_with_bgfilter",
+                "segment_image_with_aliyun_matting",
                 "remove_editor_generated_green_screen_background",
             ],
         );