diff --git a/docs/FreeCAD 3D自动布线设计方案.md b/docs/FreeCAD 3D自动布线设计方案.md
index 50ac511..2965f04 100644
--- a/docs/FreeCAD 3D自动布线设计方案.md	
+++ b/docs/FreeCAD 3D自动布线设计方案.md	
@@ -195,8 +195,11 @@ QetAutoRouteDiagnosticsJson
 QetRoutingSourceKind = "WireDuct"
 QetRoutingObstacleMode = "PassThrough"
 QetRouteCarrierName = <generated carrier name>
+QetWireDuctEndMarginMm = 20.0
 ```
 
+`QetWireDuctEndMarginMm` 表示自动生成的线槽中心线距离线槽两端缩进多少毫米。默认值用于避开线槽端盖/端部开口；如果某个线槽很短，或现场希望中心路径更靠近端部，可以在 FreeCAD 属性面板中按对象调整。
+
 ## 4. 算法设计
 
 ### 4.1 路由网络构建
@@ -425,6 +428,7 @@ tests/python/freecad_exchange_auto_routing_test.py
 25. `WiringCutOut` 会在穿孔方向外扩虚拟路径，用于桥接开孔两侧附近的线槽或支撑面网络，并支持通过 `QetWiringCutOutBridgeExtensionMm` 按对象调整外扩距离。
 26. `QetRouteTrackJson` 会在 carrier 有源对象元数据时保存 `source_name`、`source_label`、`source_kind`，方便核对导线实际走过的线槽、过线孔或支撑面。
 27. 批量布线报告会显示一条路径示例，列出首条可追踪导线经过的源对象标签。
+28. 线槽源对象支持通过 `QetWireDuctEndMarginMm` 按对象调整中心路径端部缩进距离。
 
 已完成 FreeCAD smoke：
 
diff --git a/src/Mod/FreeCADExchange/RoutingNetwork.py b/src/Mod/FreeCADExchange/RoutingNetwork.py
index bbe6427..26da3be 100644
--- a/src/Mod/FreeCADExchange/RoutingNetwork.py
+++ b/src/Mod/FreeCADExchange/RoutingNetwork.py
@@ -502,7 +502,17 @@ def _route_carrier_capacity_value(obj, default=1):
     return int(default or 1)
 
 
-def _set_wire_duct_source_semantics(source):
+def _wire_duct_end_margin_value(source, default=DEFAULT_WIRE_DUCT_MARGIN):
+    try:
+        value = float(getattr(source, "QetWireDuctEndMarginMm", default) or 0.0)
+    except Exception:
+        value = float(default or 0.0)
+    if value < 0.0:
+        return 0.0
+    return value
+
+
+def _set_wire_duct_source_semantics(source, end_margin=DEFAULT_WIRE_DUCT_MARGIN):
     if source is None:
         return
     TerminalObjects.ensure_string_property(
@@ -525,6 +535,12 @@ def _set_wire_duct_source_semantics(source):
         "How many routed wires can reuse generated wire duct segments before detouring is preferred",
         _route_carrier_capacity_value(source, default=1),
     )
+    _ensure_float_property(
+        source,
+        "QetWireDuctEndMarginMm",
+        "How far generated wire duct centerlines stay inside each duct end",
+        _wire_duct_end_margin_value(source, default=end_margin),
+    )
 
 
 def _set_support_surface_source_semantics(source):
@@ -1463,7 +1479,14 @@ def _wire_duct_centerline_from_bbox(bbox, margin=DEFAULT_WIRE_DUCT_MARGIN, min_a
     ).get("centerline", [])
 
 
-def _sync_wire_duct_source_carriers(doc, source, spec, project_uuid="", capacity=1):
+def _sync_wire_duct_source_carriers(
+    doc,
+    source,
+    spec,
+    project_uuid="",
+    capacity=1,
+    end_margin=DEFAULT_WIRE_DUCT_MARGIN,
+):
     carriers = _live_source_carriers(doc, source)
     if not carriers:
         return False
@@ -1489,7 +1512,7 @@ def _sync_wire_duct_source_carriers(doc, source, spec, project_uuid="", capacity
             updated.append(carrier)
 
     if updated:
-        _mark_wire_duct_source(source, updated[0], updated)
+        _mark_wire_duct_source(source, updated[0], updated, end_margin=end_margin)
         try:
             doc.recompute()
         except Exception:
@@ -1627,11 +1650,11 @@ def _remember_source_carriers(source, carriers):
         )
 
 
-def _mark_wire_duct_source(source, carrier, carriers=None):
+def _mark_wire_duct_source(source, carrier, carriers=None, end_margin=DEFAULT_WIRE_DUCT_MARGIN):
     if source is None:
         return
     try:
-        _set_wire_duct_source_semantics(source)
+        _set_wire_duct_source_semantics(source, end_margin=end_margin)
         if carrier is not None:
             TerminalObjects.ensure_string_property(
                 source,
@@ -1876,9 +1899,10 @@ def create_wire_duct_carriers_from_document(
         bbox = _bound_box_from_object(source)
         if bbox is None:
             continue
+        source_margin = _wire_duct_end_margin_value(source, default=margin)
         spec = _wire_duct_centerline_spec_from_bbox(
             bbox,
-            margin=margin,
+            margin=source_margin,
             min_aspect=min_aspect,
         )
         points = spec.get("centerline", [])
@@ -1892,6 +1916,7 @@ def create_wire_duct_carriers_from_document(
             spec,
             project_uuid=project_uuid,
             capacity=capacity,
+            end_margin=source_margin,
         ):
             continue
         carrier = create_route_carrier(
@@ -1917,7 +1942,7 @@ def create_wire_duct_carriers_from_document(
             )
             source_created.append(open_end_carrier)
             created.append(open_end_carrier)
-        _mark_wire_duct_source(source, carrier, source_created)
+        _mark_wire_duct_source(source, carrier, source_created, end_margin=source_margin)
     return created
 
 
@@ -2247,9 +2272,10 @@ def create_wire_duct_carriers_from_selection(
         bbox = _bound_box_from_object(source)
         if bbox is None:
             continue
+        source_margin = _wire_duct_end_margin_value(source, default=margin)
         spec = _wire_duct_centerline_spec_from_bbox(
             bbox,
-            margin=margin,
+            margin=source_margin,
             min_aspect=min_aspect,
         )
         points = spec.get("centerline", [])
@@ -2263,6 +2289,7 @@ def create_wire_duct_carriers_from_selection(
             spec,
             project_uuid=project_uuid,
             capacity=capacity,
+            end_margin=source_margin,
         ):
             continue
         carrier = create_route_carrier(
@@ -2288,7 +2315,7 @@ def create_wire_duct_carriers_from_selection(
             )
             source_created.append(open_end_carrier)
             created.append(open_end_carrier)
-        _mark_wire_duct_source(source, carrier, source_created)
+        _mark_wire_duct_source(source, carrier, source_created, end_margin=source_margin)
     return created
 
 
diff --git a/tests/python/freecad_exchange_auto_routing_test.py b/tests/python/freecad_exchange_auto_routing_test.py
index 1cf7c64..b2ab08d 100644
--- a/tests/python/freecad_exchange_auto_routing_test.py
+++ b/tests/python/freecad_exchange_auto_routing_test.py
@@ -1648,6 +1648,26 @@ class AutoRoutingTest(unittest.TestCase):
         self.assertEqual("PassThrough", duct.QetRoutingObstacleMode)
         self.assertEqual([(20.0, 0.0, 15.0), (100.0, 0.0, 15.0)], [(p.x, p.y, p.z) for p in carrier.Points])
 
+    def test_wire_duct_source_end_margin_controls_generated_centerline_length(self):
+        _install_fake_freecad()
+        terminal_objects, _wiring_objects, routing_network, _auto_routing = _reload_modules()
+        doc = FakeDocument()
+        terminal_objects.ensure_root_group(doc, "project-1")
+        duct = doc.addObject("Part::Feature", "WireDuctA")
+        duct.Label = "线槽A"
+        duct.Shape = FakeShape(FakeBoundBox(0, 120, -10, 10, 5, 25))
+        duct.QetWireDuctEndMarginMm = 5.0
+
+        created = routing_network.create_wire_duct_carriers_from_document(
+            doc,
+            project_uuid="project-1",
+        )
+
+        carrier = [item for item in created if item.QetRouteCarrierKind == "WireDuct"][0]
+        self.assertIn("QetWireDuctEndMarginMm", duct.PropertiesList)
+        self.assertEqual(5.0, duct.QetWireDuctEndMarginMm)
+        self.assertEqual([(5.0, 0.0, 15.0), (115.0, 0.0, 15.0)], [(p.x, p.y, p.z) for p in carrier.Points])
+
     def test_wire_duct_source_capacity_is_copied_to_generated_carriers(self):
         _install_fake_freecad()
         terminal_objects, _wiring_objects, routing_network, _auto_routing = _reload_modules()