diff --git a/src/Add-on/ActivityLayerBoard.ts b/src/Add-on/ActivityLayerBoard.ts
index e59b455cc..ebf427cd9 100644
--- a/src/Add-on/ActivityLayerBoard.ts
+++ b/src/Add-on/ActivityLayerBoard.ts
@@ -41,7 +41,6 @@ export class ActicityLayerBoard implements Command
             let rules = store.rules;
             if (rules.length === 0)
             {
-                nailOption.count = 0;
                 Log("错误:层板钉数量为空");
             }
 
diff --git a/src/Add-on/DrawBoard/ActivityLayerBoardTool.ts b/src/Add-on/DrawBoard/ActivityLayerBoardTool.ts
index 4b0469949..90af12239 100644
--- a/src/Add-on/DrawBoard/ActivityLayerBoardTool.ts
+++ b/src/Add-on/DrawBoard/ActivityLayerBoardTool.ts
@@ -124,27 +124,26 @@ class ActivityLayerBoardTool
         }
         return 0;
     }
-    private BuildNails(initNail: CylinderHole, nailOpt: LayerNailOption, face: Face, fYVec: Vector3)
+    private BuildNails(initNail: CylinderHole, nailOpt: LayerNailOption, face: Face, fYVec: Vector3, nailCount: number)
     {
         let fXVec = new Vector3().setFromMatrixColumn(face.OCS, 0);
         let addCount = nailOpt.addCount;
-        let count = nailOpt.count;
         let dist = nailOpt.dist;
         let frontDist = nailOpt.front;
         let backDist = nailOpt.behind;
         let singleDist: number;
         //绘制数量为1时,层板钉在中间位置
-        if (count === 1)
+        if (nailCount === 1)
             singleDist = face.Length / 2 - frontDist;
         else
-            singleDist = (face.Length - frontDist - backDist) / (count - 1);
+            singleDist = (face.Length - frontDist - backDist) / (nailCount - 1);
 
         let buildNails: CylinderHole[] = [];
 
         //构建层板钉
-        for (let i = 0; i < count; i++)
+        for (let i = 0; i < nailCount; i++)
         {
-            if (count === 1)
+            if (nailCount === 1)
             {
                 initNail.ApplyMatrix(MoveMatrix(fXVec.multiplyScalar(singleDist)));
                 buildNails.push(initNail);
@@ -256,12 +255,14 @@ class ActivityLayerBoardTool
                         nail.Position = nail.Position.add(new Vector3(xDist, yDist, zDist));
                         nail.ApplyMatrix(zRoMat).ApplyMatrix(face.OCS);
 
+                        //层板钉数
+                        let nailCount = nailOption.count;
                         if (option || this.NailRules)
-                            nailOption.count = this.GetRuleCount(face.Length, rules);
+                            nailCount = this.GetRuleCount(face.Length, rules);
 
                         let yVec = new Vector3().setFromMatrixColumn(otherBoard.OCS, 1);
 
-                        let nails = this.BuildNails(nail, nailOption, face, yVec);
+                        let nails = this.BuildNails(nail, nailOption, face, yVec, nailCount);
                         for (let nail of nails)
                             nailBoardMap.set(nail, otherBoard);
                         allNails.push(...nails);
diff --git a/src/UI/Components/Modal/ActivityLayerBoard.tsx b/src/UI/Components/Modal/ActivityLayerBoard.tsx
index f20e0ee44..3b4f3e51e 100644
--- a/src/UI/Components/Modal/ActivityLayerBoard.tsx
+++ b/src/UI/Components/Modal/ActivityLayerBoard.tsx
@@ -153,7 +153,6 @@ export class ActivityLayerBoard extends React.Component<IActivityLayerBoardProps
                                     nailOpt.isGroup = !nailOpt.isGroup;
                                 }} /> */}
                                     <Checkbox
-                                        style={{ marginLeft: 30 }}
                                         checked={nailOpt.isInBack}
                                         label="背板绘制层板钉"
                                         disabled={!nailOpt.isDraw}
diff --git a/src/UI/Store/ActivityLayerBoardStore.ts b/src/UI/Store/ActivityLayerBoardStore.ts
index b5ee3846b..33f229ede 100644
--- a/src/UI/Store/ActivityLayerBoardStore.ts
+++ b/src/UI/Store/ActivityLayerBoardStore.ts
@@ -19,7 +19,7 @@ export class ActivityLayerBoardStore extends BoardStore<IShinkOption>
         isLREqual: true,
         isFBEqual: true,
     };
-    @observable nailOption: LayerNailOption = { ...DefaultNailOption, count: 0, };
+    @observable nailOption: LayerNailOption = { ...DefaultNailOption };
     @observable private uiNailOption: IUiOption<LayerNailOption>;
     @observable currentRule: INailRule = {
         startDist: 0,