diff --git a/exmath/benchmark/round_test.go b/exmath/benchmark/round_test.go
new file mode 100644
index 0000000..bb09610
--- /dev/null
+++ b/exmath/benchmark/round_test.go
@@ -0,0 +1,14 @@
+package benchmark
+
+import (
+	"testing"
+
+	"github.com/thinkeridea/go-extend/exmath"
+)
+
+func BenchmarkRound(b *testing.B) {
+	f := 0.15807659924030304
+	for i := 0; i < b.N; i++ {
+		_ = exmath.Round(f, 5)
+	}
+}
diff --git a/exmath/round.go b/exmath/round.go
index a005cfe..712cf4e 100644
--- a/exmath/round.go
+++ b/exmath/round.go
@@ -11,5 +11,5 @@ import (
 // 返回将 val 根据指定精度 precision（十进制小数点后数字的数目）进行四舍五入的结果。precision 也可以是负数或零。
 func Round(val float64, precision int) float64 {
 	p := math.Pow10(precision)
-	return math.Floor((val+(0.5/p))*p) / p
+	return math.Floor(val*p+0.5) / p
 }
diff --git a/exmath/round_test.go b/exmath/round_test.go
index c4f3bfa..3dc02c0 100644
--- a/exmath/round_test.go
+++ b/exmath/round_test.go
@@ -65,3 +65,4 @@ func TestRound(t *testing.T) {
 		}
 	}
 }
+