diff --git a/src/Add-on/DrawLine.ts b/src/Add-on/DrawLine.ts
index c4dd26b8f..9b60ce79b 100644
--- a/src/Add-on/DrawLine.ts
+++ b/src/Add-on/DrawLine.ts
@@ -85,7 +85,7 @@ export class DrawLine implements Command
         UCSUtils.SetUCSFromPointRes(ptRes);
 
         let ptLast = ptRes.Point;
-        let firstSnapModeIsTan = ptRes.SnaoMode === ObjectSnapMode.Tan;
+        let firstSnapModeIsTan = ptRes.SnapMode === ObjectSnapMode.Tan;
         let secondSnapModelIsTan = false;
 
         let firstTangeCircle: Circle | Arc;
@@ -158,9 +158,9 @@ export class DrawLine implements Command
             if (ptRes.Status === PromptStatus.OK)
             {
                 //第一个是切点 第二个也是选切点
-                if (ptRes.SnaoMode === ObjectSnapMode.Tan && firstTangeCircle && pts.length === 1)
+                if (ptRes.SnapMode === ObjectSnapMode.Tan && firstTangeCircle && pts.length === 1)
                 {
-                    let pick = new SelectPick(app.Viewer, app.Viewer.WorldToScreen(ptRes.Point));
+                    let pick = new SelectPick(app.Viewer, app.Viewer.WorldToScreen(ptRes.Point), app.Editor.GetPointServices.snapServices.SnapSize);
                     pick.Select(app.Viewer.VisibleObjects, { filterTypes: [Circle, Arc] });
                     let secondTangeCircle: Circle = (pick.SelectEntityList as Circle[]).find(c => c.PtInCurve(ptRes.Point));
 
diff --git a/src/Common/CurveUtils.ts b/src/Common/CurveUtils.ts
index 38ad2e6db..e87b1787f 100644
--- a/src/Common/CurveUtils.ts
+++ b/src/Common/CurveUtils.ts
@@ -400,6 +400,8 @@ export function CircleInternalTangentLines(cir0: Circle, cir1: Circle): Line[]
     }
 }
 
+//ref https://github1s.com/ArashPartow/wykobi/blob/master/wykobi.inl#L6575-L6576
+//获取2个圆的外切线
 export function CircleOuterTangentLines(circle0: Circle, circle1: Circle): Line[]
 {
     let c0 = circle0.Center;
diff --git a/src/Editor/GetPointServices.ts b/src/Editor/GetPointServices.ts
index 3318c15c9..7f5608569 100644
--- a/src/Editor/GetPointServices.ts
+++ b/src/Editor/GetPointServices.ts
@@ -499,7 +499,7 @@ export class GetPointServices implements EditorService
         retValue.Point = p;
         retValue.intersection = this.intersection;
 
-        retValue.SnaoMode = snapMode;
+        retValue.SnapMode = snapMode;
 
         this.lastPoint = p;
 
diff --git a/src/Editor/PromptResult.ts b/src/Editor/PromptResult.ts
index 37949a355..abdfb07ab 100644
--- a/src/Editor/PromptResult.ts
+++ b/src/Editor/PromptResult.ts
@@ -40,7 +40,8 @@ export class PromptResult
 
 export class PromptPointResult extends PromptResult
 {
-    SnaoMode: ObjectSnapMode;
+    SnapMode: ObjectSnapMode;
+    // SnapEntity: Entity; TODO:
     intersection: Intersection;
     private _point: Vector3;
     /**