diff --git a/apps/api/app/services/plan_generator_service.py b/apps/api/app/services/plan_generator_service.py
index a124e83dc..db68aa8f8 100644
--- a/apps/api/app/services/plan_generator_service.py
+++ b/apps/api/app/services/plan_generator_service.py
@@ -224,7 +224,7 @@ class PlanGeneratorService:
             )
             order += 1
             # 剩余为 overlay
-            for i in range(1, n):
+            for _ in range(1, n):
                 clips.append(
                     EditPlanClip.create(
                         plan_id=plan_id,
@@ -237,7 +237,7 @@ class PlanGeneratorService:
 
         elif editing_mode == EditingMode.VOICE_OVER.value:
             # N 个 main clips（B-roll）
-            for i in range(n):
+            for _ in range(n):
                 clips.append(
                     EditPlanClip.create(
                         plan_id=plan_id,
@@ -271,7 +271,7 @@ class PlanGeneratorService:
             )
             order += 1
             # 剩余为 b_roll
-            for i in range(2, n):
+            for _ in range(2, n):
                 clips.append(
                     EditPlanClip.create(
                         plan_id=plan_id,
@@ -284,7 +284,7 @@ class PlanGeneratorService:
 
         else:
             # ONE_TAKE: N 个 main clips
-            for i in range(n):
+            for _ in range(n):
                 clips.append(
                     EditPlanClip.create(
                         plan_id=plan_id,
diff --git a/apps/worker/video_processing/pip_engine.py b/apps/worker/video_processing/pip_engine.py
index 59c26d6ef..bc231b2cb 100755
--- a/apps/worker/video_processing/pip_engine.py
+++ b/apps/worker/video_processing/pip_engine.py
@@ -403,7 +403,7 @@ class PiPEngine:
         input_args: list[str] = []
         current_label = base_label
 
-        for i, (input_label, layer, path) in enumerate(pip_sources):
+        for i, (_input_label, layer, path) in enumerate(pip_sources):
             # 添加输入
             input_args.extend(["-i", str(path)])
 
diff --git a/apps/worker/video_processing/sticker_engine.py b/apps/worker/video_processing/sticker_engine.py
index afbdc996e..67ff13397 100755
--- a/apps/worker/video_processing/sticker_engine.py
+++ b/apps/worker/video_processing/sticker_engine.py
@@ -359,7 +359,7 @@ class StickerEngine:
         image_stickers: list[ImageStickerConfig] = []
         image_paths: list[str] = []
 
-        for i, s in enumerate(stickers):
+        for _, s in enumerate(stickers):
             try:
                 sticker_type = s.get("type", "image")
                 z = int(s.get("z_index", 10))
diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index 7a9247719..71db53f6b 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -137,7 +137,7 @@ class PerfAssert:
             result = PerfResult(name=name or threshold_level, threshold_ms=threshold_ms)
 
             last_response = None
-            for i in range(num_samples):
+            for _ in range(num_samples):
                 start = time.perf_counter()
                 last_response = func()
                 elapsed = (time.perf_counter() - start) * 1000
@@ -261,7 +261,7 @@ def run_perf_test(
     result = PerfResult(name=name, threshold_ms=threshold_ms)
 
     last_response = None
-    for i in range(samples):
+    for _ in range(samples):
         start = time.perf_counter()
         last_response = func()
         elapsed = (time.perf_counter() - start) * 1000
diff --git a/tests/integration/test_error_scenarios.py b/tests/integration/test_error_scenarios.py
index 34601720e..c48739354 100755
--- a/tests/integration/test_error_scenarios.py
+++ b/tests/integration/test_error_scenarios.py
@@ -530,7 +530,7 @@ class TestLargeDataRequests:
     def test_rapid_sequential_requests(self, auth_headers):
         """快速连续请求不应触发限流导致 500。"""
         statuses = []
-        for i in range(20):
+        for _ in range(20):
             resp = client.get("/api/v1/projects", headers=auth_headers)
             statuses.append(resp.status_code)
 
diff --git a/tests/unit/test_pr312_security_debt.py b/tests/unit/test_pr312_security_debt.py
index 14225835d..c1a685685 100644
--- a/tests/unit/test_pr312_security_debt.py
+++ b/tests/unit/test_pr312_security_debt.py
@@ -253,7 +253,7 @@ class TestConcatSecurity:
 
         # 创建超过上限的段数
         segments = []
-        for i in range(MAX_CONCAT_SEGMENTS + 5):
+        for _ in range(MAX_CONCAT_SEGMENTS + 5):
             segments.append(ConcatSegment(video_path=str(sample_video)))
 
         config = ConcatConfig(segments=segments)
diff --git a/tests/unit/test_tts_segment_synthesis.py b/tests/unit/test_tts_segment_synthesis.py
index e729d0665..5159683fe 100755
--- a/tests/unit/test_tts_segment_synthesis.py
+++ b/tests/unit/test_tts_segment_synthesis.py
@@ -115,7 +115,7 @@ class TestAudioMerger:
 
         # 创建临时文件
         paths = []
-        for i in range(3):
+        for _ in range(3):
             with tempfile.NamedTemporaryFile(suffix=".mp3", delete=False) as f:
                 f.write(b"audio")
                 paths.append(f.name)
@@ -151,7 +151,7 @@ class TestAudioMerger:
         mock_run_ffmpeg.side_effect = CalledProcessError(returncode=1, cmd=["ffmpeg"], stderr="error details")
 
         paths = []
-        for i in range(2):
+        for _ in range(2):
             with tempfile.NamedTemporaryFile(suffix=".mp3", delete=False) as f:
                 f.write(b"audio")
                 paths.append(f.name)