diff --git a/src/UI/WPF/Views/CornerTurnCheckDialog.xaml.cs b/src/UI/WPF/Views/CornerTurnCheckDialog.xaml.cs
index 055437d..de7b436 100644
--- a/src/UI/WPF/Views/CornerTurnCheckDialog.xaml.cs
+++ b/src/UI/WPF/Views/CornerTurnCheckDialog.xaml.cs
@@ -28,7 +28,7 @@ namespace NavisworksTransport.UI.WPF.Views
                 ResultBorder.BorderBrush = new SolidColorBrush(Color.FromRgb(76, 175, 80));
                 ResultTitle.Text = "✅ 可通过";
                 ResultTitle.Foreground = new SolidColorBrush(Color.FromRgb(46, 125, 50));
-                ResultDetail.Text = $"余量: {margin:F2} 米\n最大可通过长度: {maxLength:F2} 米";
+                ResultDetail.Text = $"余量: {margin:F2} 米\n临界长度: {maxLength:F2} 米";
             }
             else
             {
@@ -36,7 +36,7 @@ namespace NavisworksTransport.UI.WPF.Views
                 ResultBorder.BorderBrush = new SolidColorBrush(Color.FromRgb(244, 67, 54));
                 ResultTitle.Text = "❌ 不可通过";
                 ResultTitle.Foreground = new SolidColorBrush(Color.FromRgb(183, 28, 28));
-                ResultDetail.Text = $"超出: {-margin:F2} 米\n当前条件下最大可通过长度: {maxLength:F2} 米";
+                ResultDetail.Text = $"不足: {-margin:F2} 米\n临界长度: {maxLength:F2} 米";
             }
         }
 
diff --git a/src/Utils/CornerTurnCheckHelper.cs b/src/Utils/CornerTurnCheckHelper.cs
index ceab30f..906e2d9 100644
--- a/src/Utils/CornerTurnCheckHelper.cs
+++ b/src/Utils/CornerTurnCheckHelper.cs
@@ -21,11 +21,11 @@ namespace NavisworksTransport.Utils
                 return false;
 
             maxLength = FindRequiredLength(width, entryWidth, exitWidth);
-            margin = length - maxLength;
-            return length >= maxLength;
+            margin = maxLength - length;
+            return length <= maxLength;
         }
 
-        /// <summary> 给定角度 θ，计算最大可通过长度 </summary>
+        /// <summary> 给定角度 θ，计算该角度下能通过的最大模块长度 </summary>
         private static double L(double theta, double width, double c1, double c2)
         {
             var sin = Math.Sin(theta);
@@ -33,7 +33,7 @@ namespace NavisworksTransport.Utils
             return (c1 - width * cos) / sin + (c2 - width * sin) / cos;
         }
 
-        /// <summary> 三分法搜索 θ ∈ (0, π/2) 上 L(θ) 的最小值 </summary>
+        /// <summary> 三分法搜索 θ ∈ (0, π/2) 上 L(θ) 的最小值（即最大可通过长度） </summary>
         private static double FindRequiredLength(double width, double c1, double c2)
         {
             double lo = 1e-6;