diff --git a/src/Obj/Base/PolylineObject/index.js b/src/Obj/Base/PolylineObject/index.js
index bdc778e..ff70456 100644
--- a/src/Obj/Base/PolylineObject/index.js
+++ b/src/Obj/Base/PolylineObject/index.js
@@ -18,6 +18,7 @@ import { setSplitDirection, syncSplitData, setActiveId } from '../../../Global/S
 import { setActiveViewer, closeRotateAround, closeViewFollow } from '../../../Global/global'
 
 class PolylineObject extends Base {
+  #unitDataLegpObject
   /**
    * @constructor
    * @param sdk
@@ -253,6 +254,7 @@ class PolylineObject extends Base {
       this._elms.lengthUnit.forEach(item => {
         item.value = v
       })
+    this.#unitDataLegpObject && this.#unitDataLegpObject.legp_searchActive(v)
     if (this.options.lengthByMeter) {
       if (this.unitNum > 2) {
         switch (v) {
@@ -1743,6 +1745,7 @@ class PolylineObject extends Base {
           '.input-select-unit',
           1
         )
+        this.#unitDataLegpObject = unitDataLegpObject
         if (unitDataLegpObject) {
           unitDataLegpObject.legp_search(unitData)
           let unitDataLegpElm = this._DialogObject._element.content