diff --git a/WindowsFormsApp6/Form3.cs b/WindowsFormsApp6/Form3.cs
index 6489898..d5d4e42 100644
--- a/WindowsFormsApp6/Form3.cs
+++ b/WindowsFormsApp6/Form3.cs
@@ -35,9 +35,10 @@ namespace WindowsFormsApp6
         private System.Windows.Forms.Timer dataTimer;
         private System.Windows.Forms.Timer clockTimer;
         private DataTable sampleDataTable;
-        private int currentSampleCount = 5; // 当前试样数量，可动态调整
+        private int currentSampleCount = 5; // 当前试样数量，固定为5（最多5组，共15次测试）
         private readonly Random random = new Random();
         private bool isVerticalLayout = true; // true=纵向（当前），false=横向
+        private const int MAX_SAMPLE_COUNT = 5; // 最大试样数量限制为5
         #endregion
 
         public Form3()
@@ -50,13 +51,16 @@ namespace WindowsFormsApp6
         }
 
         /// <summary>
-        /// 设置试样数量（1-20）
+        /// 设置试样数量（1-5）
+        /// Form3限定为最多5组试样，每组3次测试，共15次测试数据
         /// </summary>
         public void SetSampleCount(int count)
         {
-            if (count < 1 || count > 20)
+            if (count < 1 || count > MAX_SAMPLE_COUNT)
             {
-                ShowMessage("试样数量必须在1-20之间", "参数错误", MessageBoxIcon.Warning);
+                ShowMessage($"试样数量必须在1-{MAX_SAMPLE_COUNT}之间\n" +
+                           $"Form3限定为最多{MAX_SAMPLE_COUNT}组试样（共{MAX_SAMPLE_COUNT * 3}次测试）", 
+                           "参数错误", MessageBoxIcon.Warning);
                 return;
             }
 
diff --git a/WindowsFormsApp6/MainForm.cs b/WindowsFormsApp6/MainForm.cs
index 5abe910..f23c436 100644
--- a/WindowsFormsApp6/MainForm.cs
+++ b/WindowsFormsApp6/MainForm.cs
@@ -1183,8 +1183,23 @@ namespace WindowsFormsApp6
                 int sampleIndex = position.Item1;  // 试样索引（1-based）
                 int testIndex = position.Item2;    // 测试次数（1-3）
 
-                // 如果需要扩展试样数量（动态增长）
-                if (sampleIndex > currentSampleCount)
+                // Form3限制：最多5组试样（15次测试）
+                const int MAX_FORM3_SAMPLES = 5;
+                
+                // 如果超过最大试样数量，显示警告并停止
+                if (sampleIndex > MAX_FORM3_SAMPLES)
+                {
+                    this.Invoke(new Action(() =>
+                    {
+                        MessageBox.Show($"Form3已达到最大试样数量限制（{MAX_FORM3_SAMPLES}组，共{MAX_FORM3_SAMPLES * 3}次测试）\n" +
+                                      "无法继续添加数据。", 
+                                      "数据已满", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                    }));
+                    return;
+                }
+
+                // 如果需要扩展试样数量（动态增长，但不超过最大值）
+                if (sampleIndex > currentSampleCount && sampleIndex <= MAX_FORM3_SAMPLES)
                 {
                     currentSampleCount = sampleIndex;
                     currentSampleCountField.SetValue(form3Instance, currentSampleCount);
@@ -1774,7 +1789,7 @@ namespace WindowsFormsApp6
             cell27.CellStyle = styles.dataStyle;
             
             ICell cell28 = infoRow2.CreateCell(9);
-            cell28.SetCellValue("(报告保存路径)");
+            cell28.SetCellValue("");
             cell28.CellStyle = styles.yellowStyle;
         }