diff --git a/MainForm.cs b/MainForm.cs
index e12cb2a..4882b49 100644
--- a/MainForm.cs
+++ b/MainForm.cs
@@ -494,6 +494,8 @@ namespace TimerApp
                 _restForm.SkipRequested += RestForm_SkipRequested;
             }
 
+            // 初始化显示时间，避免显示默认值
+            _restForm.UpdateTime(_monitor.RestDuration);
             _restForm.Show();
         }
 
diff --git a/RestForm.cs b/RestForm.cs
index fb219c1..2a2c4f1 100644
--- a/RestForm.cs
+++ b/RestForm.cs
@@ -63,7 +63,7 @@ namespace TimerApp
             // 初始大小，会在CenterControls中动态调整
             this.lblTimer.Size = new System.Drawing.Size(400, 180);
             this.lblTimer.TabIndex = 1;
-            this.lblTimer.Text = "01:00";
+            this.lblTimer.Text = "--:--";
             this.lblTimer.TextAlign = ContentAlignment.MiddleCenter;
 
             //