diff --git a/DotNetCampus.Numerics/FloatingPointNumberExtensions.cs b/DotNetCampus.Numerics/FloatingPointNumberExtensions.cs
index 14f4645..23eca56 100644
--- a/DotNetCampus.Numerics/FloatingPointNumberExtensions.cs
+++ b/DotNetCampus.Numerics/FloatingPointNumberExtensions.cs
@@ -107,7 +107,7 @@ public static int RoundingHalfAwayFromZero(this float value)
     /// <returns>五舍六入到整数。</returns>
     public static int RoundingHalfToZero(this double value)
     {
-        return (int)Math.Truncate(value + Math.CopySign(0.5, value));
+        return (int)Math.Truncate(value - Math.CopySign(0.5, value));
     }
 
     /// <summary>
@@ -117,7 +117,7 @@ public static int RoundingHalfToZero(this double value)
     /// <returns>五舍六入到整数。</returns>
     public static int RoundingHalfToZero(this float value)
     {
-        return (int)MathF.Truncate(value + MathF.CopySign(0.5f, value));
+        return (int)MathF.Truncate(value - MathF.CopySign(0.5f, value));
     }
 
     /// <summary>