diff --git a/ViewModels/D7896ViewModel.cs b/ViewModels/D7896ViewModel.cs
index acb1ec5..9900778 100644
--- a/ViewModels/D7896ViewModel.cs
+++ b/ViewModels/D7896ViewModel.cs
@@ -303,7 +303,7 @@ public partial class D7896ViewModel : ObservableObject
                 double[] ustdBase = await _th1963Ustd.FetchBatchAsync();
                 double[] uptBase = await _th1953Ustd.FetchBatchAsync();
 
-                double dynamicR0 = 2.45; // 默认值
+                double dynamicR0 = 1.49; // 默认值
                 if (ustdBase != null && ustdBase.Length > 0 && uptBase != null && uptBase.Length > 0)
                 {
                     double sumR0 = 0; int cnt = 0;
@@ -348,7 +348,7 @@ public partial class D7896ViewModel : ObservableObject
                 double[] ustd = await _th1963Ustd.FetchBatchAsync();
                 double[] upt = await _th1953Ustd.FetchBatchAsync();
 
-                if (dynamicR0 == 2.45) // 基线无效
+                if (dynamicR0 == 1.49) // 基线无效
                 {
                     double sumR0 = 0; int cnt = 0;
                     for (int j = 2; j < Math.Min(6, ustd.Length); j++)