diff --git a/backend/tests/test_evidence_v2_to_cdsl.py b/backend/tests/test_evidence_v2_to_cdsl.py
index 4ddc3819..31efd0dc 100644
--- a/backend/tests/test_evidence_v2_to_cdsl.py
+++ b/backend/tests/test_evidence_v2_to_cdsl.py
@@ -174,6 +174,44 @@ class EvidenceV2ToCdslTests(unittest.TestCase):
         self.assertTrue(comparison["numeric_geometry_match"])
         self.assertTrue(comparison["topology_counts_match"])
 
+    def _chamfer_only_fixture(self, dimensions: list[float], props: dict | None = None) -> dict:
+        return {
+            "schema": "solidworks.cad_evidence.v2",
+            "status": "complete_with_blockers",
+            "self_validation": {"feature_contracts": []},
+            "features": [{
+                "sequence": 1, "name": "Chamfer", "effective_type": "Chamfer", "stable_id": "chamfer",
+                "definition_properties": {"values": props or {}},
+                "definition_methods": {"values": {}}, "parents": [], "selections": [],
+                "dimensions": [{"system_value": value} for value in dimensions],
+            }],
+        }
+
+    def test_chamfer_exports_radian_angle_instead_of_silent_equidistant_distance(self) -> None:
+        # Distance-Angle 倒角：dimensions=[0.001m, 0.785398]，无 EdgeChamferAngle 属性，
+        # 走 raw 兜底路径。角度 system value 为弧度，distance_mm 按米→毫米换算。
+        fixture = self._chamfer_only_fixture([0.001, 0.785398])
+        cdsl, _ = convert_evidence(fixture, source_name="chamfer-angle.solidworks_evidence_v2.json")
+        params = next(item for item in cdsl["features"] if item["atomic_id"] == "chamfer")["params"]
+        self.assertAlmostEqual(params["distance_mm"], 1.0, places=9)
+        self.assertNotIn("distance_2_mm", params)
+        self.assertAlmostEqual(params["angle_rad"], 0.785398, places=5)
+
+    def test_chamfer_prefers_edge_chamfer_angle_property(self) -> None:
+        fixture = self._chamfer_only_fixture([0.001, 0.785398], props={"EdgeChamferAngle": 1.047197551})
+        cdsl, _ = convert_evidence(fixture, source_name="chamfer-prop.solidworks_evidence_v2.json")
+        params = next(item for item in cdsl["features"] if item["atomic_id"] == "chamfer")["params"]
+        self.assertAlmostEqual(params["distance_mm"], 1.0, places=9)
+        self.assertAlmostEqual(params["angle_rad"], 1.047197551, places=6)
+
+    def test_chamfer_keeps_equidistant_form_when_angle_is_missing(self) -> None:
+        fixture = self._chamfer_only_fixture([0.001])
+        cdsl, _ = convert_evidence(fixture, source_name="chamfer-eq.solidworks_evidence_v2.json")
+        params = next(item for item in cdsl["features"] if item["atomic_id"] == "chamfer")["params"]
+        self.assertAlmostEqual(params["distance_mm"], 1.0, places=9)
+        self.assertNotIn("angle_rad", params)
+        self.assertNotIn("distance_2_mm", params)
+
 
 if __name__ == "__main__":
     unittest.main()