diff --git a/src/main/java/minsecurity/crypto/sm2/SM2Base.java b/src/main/java/minsecurity/crypto/sm2/SM2Base.java
index e134585..de2d64c 100644
--- a/src/main/java/minsecurity/crypto/sm2/SM2Base.java
+++ b/src/main/java/minsecurity/crypto/sm2/SM2Base.java
@@ -14,6 +14,7 @@ import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.bouncycastle.jce.spec.ECParameterSpec;
 import org.bouncycastle.math.ec.ECPoint;
 import org.bouncycastle.math.ec.custom.gm.SM2P256V1Curve;
+import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
 import org.slf4j.LoggerFactory;
 
 import java.math.BigInteger;
@@ -187,11 +188,11 @@ public class SM2Base {
      **/
     public static byte[] byteArraytoHexByteArray(byte[] bytes){
         // 16进制表示法
-        StringBuilder sb = new StringBuilder();
-        for(int i=0;i < bytes.length;i++) {
-            sb.append(String.format("%02x", bytes[i]));
-        }
-        String hexStr = sb.toString();
+//        StringBuilder sb = new StringBuilder();
+//        for(int i=0;i < bytes.length;i++) {
+//            sb.append(String.format("%02x", bytes[i]));
+//        }
+        String hexStr = ByteUtils.toHexString(bytes);
         return hexStr.getBytes();
     }
 
diff --git a/src/main/java/minsecurity/crypto/sm2/SM2PrivateKey.java b/src/main/java/minsecurity/crypto/sm2/SM2PrivateKey.java
index fd39cec..10467ad 100644
--- a/src/main/java/minsecurity/crypto/sm2/SM2PrivateKey.java
+++ b/src/main/java/minsecurity/crypto/sm2/SM2PrivateKey.java
@@ -75,7 +75,7 @@ public class SM2PrivateKey implements PrivateKeyInterface {
      */
     // TODO 实现不同
     public boolean setBytes(byte[] d){
-        if (d.length != 64 && d.length != 32 && d.length != 33)
+        if (d.length != 64 && d.length != 66 && d.length != 32 && d.length != 33)
             return false;
         switch (d.length){
             case 32:
@@ -83,6 +83,7 @@ public class SM2PrivateKey implements PrivateKeyInterface {
                 privateKey = new ECPrivateKeyParameters(new BigInteger(d), SM2Base.DOMAIN_PARAMS);
                 break;
             case 64:
+            case 66:
                 d = SM2Base.hexByteArrayToByteArray(d);
                 privateKey = new ECPrivateKeyParameters(new BigInteger(d), SM2Base.DOMAIN_PARAMS);
                 break;