diff --git a/gm/sm2/sm2_test.go b/gm/sm2/sm2_test.go
index a7838262..42768363 100644
--- a/gm/sm2/sm2_test.go
+++ b/gm/sm2/sm2_test.go
@@ -26,6 +26,11 @@ func decodePEM(pubPEM string) *pem.Block {
     return block
 }
 
+func fromHex(s string) []byte {
+    h, _ := hex.DecodeString(s)
+    return h
+}
+
 func Test_Sm2(t *testing.T) {
     priv, err := sm2.GenerateKey(rand.Reader) // 生成密钥对
     if err != nil {
@@ -1110,3 +1115,13 @@ func Test_Sign_Func_Encoding(t *testing.T) {
         })
     })
 }
+
+func Test_CheckPrivKey(t *testing.T) {
+    pri := "00377febf6f6fd530121d471ec27db463c63df6a38c94a75618a57ee48824fa0"
+
+    _, err := sm2.NewPrivateKey(fromHex(pri))
+    if err != nil {
+        t.Fatal(err)
+    }
+
+}