diff --git a/sm4/sm4.go b/sm4/sm4.go
index 0e301deb..83a8b576 100644
--- a/sm4/sm4.go
+++ b/sm4/sm4.go
@@ -355,17 +355,11 @@ func Sm4Ecb(key []byte, in []byte, mode bool) (out []byte, err error) {
 	}
 	if mode {
 		for i := 0; i < len(inData)/16; i++ {
-			in_tmp := inData[i*16 : i*16+16]
-			out_tmp := make([]byte, 16)
-			c.Encrypt(out_tmp, in_tmp)
-			copy(out[i*16:i*16+16], out_tmp)
+			c.Encrypt(out[i*16:i*16+16], inData[i*16:i*16+16])
 		}
 	} else {
 		for i := 0; i < len(inData)/16; i++ {
-			in_tmp := inData[i*16 : i*16+16]
-			out_tmp := make([]byte, 16)
-			c.Decrypt(out_tmp, in_tmp)
-			copy(out[i*16:i*16+16], out_tmp)
+			c.Decrypt(out[i*16:i*16+16], inData[i*16:i*16+16])
 		}
 		out, _ = pkcs7UnPadding(out)
 	}
diff --git a/sm4/sm4_test.go b/sm4/sm4_test.go
index 6115ba14..e3b7b7c5 100644
--- a/sm4/sm4_test.go
+++ b/sm4/sm4_test.go
@@ -16,6 +16,7 @@ limitations under the License.
 package sm4
 
 import (
+	"bytes"
 	"fmt"
 	"reflect"
 	"testing"
@@ -151,3 +152,27 @@ func testCompare(key1, key2 []byte) bool {
 	}
 	return true
 }
+
+func BenchmarkSm4EcbEncode(b *testing.B) {
+	key := []byte("0123456789abcdef")
+	data := bytes.Repeat([]byte("0123456789abcdef"), 10)
+
+	for i := 0; i < b.N; i++ {
+		_, err := Sm4Ecb(key, data, true)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkSm4EcbDecode(b *testing.B) {
+	key := []byte("0123456789abcdef")
+	data := []byte("13278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b8613278c63b7305e3c131cdbbbe6f59b86d14d7078d2f3a67fe00d3221dbb1d556")
+
+	for i := 0; i < b.N; i++ {
+		_, err := Sm4Ecb(key, data, false)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}