diff --git a/src/test/java/VMSConnection/Security/TestSM4.java b/src/test/java/VMSConnection/Security/TestSM4.java
new file mode 100644
index 0000000..665f597
--- /dev/null
+++ b/src/test/java/VMSConnection/Security/TestSM4.java
@@ -0,0 +1,34 @@
+package VMSConnection.Security;
+
+import VMSConnection.Security.SM4.BC_SM4;
+import org.junit.Test;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import java.nio.charset.StandardCharsets;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+import java.util.Arrays;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 15:04 2021/7/22
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class TestSM4 {
+    @Test
+    public void testSM4(){
+        try {
+            byte[] enc=BC_SM4.encrypt_ECB_Padding("1234567812345678".getBytes(StandardCharsets.UTF_8),
+                    "wefree".getBytes(StandardCharsets.UTF_8));
+            System.out.println(Arrays.toString(enc));
+        } catch (InvalidKeyException | NoSuchAlgorithmException | NoSuchProviderException
+                | NoSuchPaddingException | IllegalBlockSizeException | BadPaddingException e) {
+            e.printStackTrace();
+        }
+    }
+}