diff --git a/Tools/ModelTranslator/bl_decimate.py b/Tools/ModelTranslator/bl_decimate.py
index ce28d707..3ccb4a93 100644
--- a/Tools/ModelTranslator/bl_decimate.py
+++ b/Tools/ModelTranslator/bl_decimate.py
@@ -28,9 +28,10 @@ UV_FLIP_TOL = 0.02      # 质量门：UV 翻转面占比超此值回退 smart_pr
 UV_OVERLAP_TOL = 0.08   # 质量门：UV 重叠面占比阈值（手工 UV 同口径约 5%，灾难性失败 >20%）
 
 
-def uv_gate_ok(flipped, overlap):
-    """UV 质量门：翻转与重叠占比都在阈值内。overlap 为 None（op 不可用）按 0 处理。"""
-    return flipped <= UV_FLIP_TOL and (overlap or 0.0) <= UV_OVERLAP_TOL
+def uv_gate_ok(flipped, overlap, overlap_tol=UV_OVERLAP_TOL):
+    """UV 质量门：翻转按 UV_FLIP_TOL 固定，重叠按 overlap_tol（默认 UV_OVERLAP_TOL）。
+    overlap 为 None（op 不可用）按 0 处理。"""
+    return flipped <= UV_FLIP_TOL and (overlap or 0.0) <= overlap_tol
 
 
 def uvpm_mode_label(base, applied):
@@ -38,11 +39,11 @@ def uvpm_mode_label(base, applied):
     return base + "+uvpm" if applied else base
 
 
-def pick_best_candidate(candidates):
+def pick_best_candidate(candidates, overlap_tol=UV_OVERLAP_TOL):
     """从候选 UV 指标 dict 列表选过质量门且岛数最少者；无过门候选返回 None。
-    每个 candidate 至少含 flipped/overlap/islands。"""
+    overlap_tol 覆盖重叠容忍。每个 candidate 至少含 flipped/overlap/islands。"""
     passing = [c for c in candidates
-               if uv_gate_ok(c["flipped"], c["overlap"])]
+               if uv_gate_ok(c["flipped"], c["overlap"], overlap_tol)]
     if not passing:
         return None
     return min(passing, key=lambda c: c["islands"])
diff --git a/Tools/ModelTranslator/tests/test_bl_decimate.py b/Tools/ModelTranslator/tests/test_bl_decimate.py
index 4edc217a..3846eb62 100644
--- a/Tools/ModelTranslator/tests/test_bl_decimate.py
+++ b/Tools/ModelTranslator/tests/test_bl_decimate.py
@@ -91,6 +91,18 @@ class TestUvGateOk(unittest.TestCase):
     def test_overlap_none_treated_as_zero(self):
         self.assertTrue(bd.uv_gate_ok(0.01, None))
 
+    def test_custom_overlap_tol_allows_higher_overlap(self):
+        self.assertTrue(bd.uv_gate_ok(0.0, 0.12, overlap_tol=0.15))
+        self.assertFalse(bd.uv_gate_ok(0.0, 0.16, overlap_tol=0.15))
+
+    def test_custom_overlap_tol_does_not_relax_flip(self):
+        # 放宽重叠不影响翻转判定（翻转仍按 UV_FLIP_TOL）
+        self.assertFalse(bd.uv_gate_ok(0.03, 0.0, overlap_tol=0.5))
+
+    def test_default_overlap_tol_matches_constant(self):
+        self.assertTrue(bd.uv_gate_ok(0.0, bd.UV_OVERLAP_TOL))
+        self.assertFalse(bd.uv_gate_ok(0.0, bd.UV_OVERLAP_TOL + 0.01))
+
 
 class TestUvpmModeLabel(unittest.TestCase):
     def test_applied_appends_suffix(self):
@@ -131,6 +143,13 @@ class TestPickBestCandidate(unittest.TestCase):
         best = bd.pick_best_candidate(cands)
         self.assertEqual(best["islands"], 42)
 
+    def test_overlap_tol_lets_more_candidates_pass(self):
+        # overlap=0.12 在默认 8% 门限下不过；放宽到 0.15 后过门并被选中
+        cands = [self._c(0.0, 0.12, 50, 55)]
+        self.assertIsNone(bd.pick_best_candidate(cands))
+        best = bd.pick_best_candidate(cands, overlap_tol=0.15)
+        self.assertEqual(best["angle"], 55)
+
 
 if __name__ == "__main__":
     unittest.main()