diff --git a/src/main/java/org/fisco/bcos/web3j/abi/EventEncoder.java b/src/main/java/org/fisco/bcos/web3j/abi/EventEncoder.java
index d0d18206d..a282f0ee7 100644
--- a/src/main/java/org/fisco/bcos/web3j/abi/EventEncoder.java
+++ b/src/main/java/org/fisco/bcos/web3j/abi/EventEncoder.java
@@ -5,6 +5,7 @@
 import org.fisco.bcos.web3j.abi.datatypes.Event;
 import org.fisco.bcos.web3j.abi.datatypes.Type;
 import org.fisco.bcos.web3j.crypto.Hash;
+import org.fisco.bcos.web3j.crypto.SmHash;
 import org.fisco.bcos.web3j.utils.Numeric;
 
 /**
@@ -35,9 +36,16 @@ static <T extends Type> String buildMethodSignature(
         return result.toString();
     }
 
-    public static String buildEventSignature(String methodSignature) {
+    public static String buildEventSignature(String methodSignature, Boolean isSm) {
         byte[] input = methodSignature.getBytes();
-        byte[] hash = Hash.sha3(input);
-        return Numeric.toHexString(hash);
+        if (Boolean.TRUE.equals(isSm)) {
+            // 国密
+            byte[] hash = SmHash.sha3(input);
+            return Numeric.toHexString(hash);
+        } else {
+            // keccak256
+            byte[] hash = Hash.sha3(input);
+            return Numeric.toHexString(hash);
+        }
     }
 }
diff --git a/src/main/java/org/fisco/bcos/web3j/crypto/SmHash.java b/src/main/java/org/fisco/bcos/web3j/crypto/SmHash.java
new file mode 100644
index 000000000..bfb402a13
--- /dev/null
+++ b/src/main/java/org/fisco/bcos/web3j/crypto/SmHash.java
@@ -0,0 +1,102 @@
+package org.fisco.bcos.web3j.crypto;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import org.bouncycastle.crypto.digests.RIPEMD160Digest;
+import org.bouncycastle.crypto.digests.SHA512Digest;
+import org.bouncycastle.crypto.macs.HMac;
+import org.bouncycastle.crypto.params.KeyParameter;
+import org.fisco.bcos.web3j.utils.Numeric;
+import org.fisco.bcos.web3j.crypto.gm.sm3.SM3Digest;
+
+/** Crypto related functions. */
+public class SmHash {
+    private SmHash() {}
+
+    private static HashInterface hashInterface = new SM3Digest();
+
+    public static HashInterface getHashInterface() {
+        return hashInterface;
+    }
+
+    public static void setHashInterface(HashInterface hashInterface) {
+        SmHash.hashInterface = hashInterface;
+    }
+
+    /**
+     * SM hash function.
+     *
+     * @param hexInput hex encoded input data with optional 0x prefix
+     * @return hash value as hex encoded string
+     */
+    public static String sha3(String hexInput) {
+        return hashInterface.hash(hexInput);
+    }
+
+    /**
+     * SM hash function.
+     *
+     * @param input binary encoded input data
+     * @param offset of start of data
+     * @param length of data
+     * @return hash value
+     */
+    public static byte[] sha3(byte[] input, int offset, int length) {
+        return hashInterface.hash(input, offset, length);
+    }
+
+    /**
+     * SM hash function.
+     *
+     * @param input binary encoded input data
+     * @return hash value
+     */
+    public static byte[] sha3(byte[] input) {
+        return hashInterface.hash(input, 0, input.length);
+    }
+
+    /**
+     * SM hash function that operates on a UTF-8 encoded String.
+     *
+     * @param utf8String UTF-8 encoded string
+     * @return hash value as hex encoded string
+     */
+    public static String sha3String(String utf8String) {
+        return Numeric.toHexString(sha3(utf8String.getBytes(StandardCharsets.UTF_8)));
+    }
+
+    /**
+     * Generates SHA-256 digest for the given {@code input}.
+     *
+     * @param input The input to digest
+     * @return The hash value for the given input
+     * @throws RuntimeException If we couldn't find any SHA-256 provider
+     */
+    public static byte[] sha256(byte[] input) {
+        try {
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            return digest.digest(input);
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("Couldn't find a SHA-256 provider", e);
+        }
+    }
+
+    public static byte[] hmacSha512(byte[] key, byte[] input) {
+        HMac hMac = new HMac(new SHA512Digest());
+        hMac.init(new KeyParameter(key));
+        hMac.update(input, 0, input.length);
+        byte[] out = new byte[64];
+        hMac.doFinal(out, 0);
+        return out;
+    }
+
+    public static byte[] sha256hash160(byte[] input) {
+        byte[] sha256 = sha256(input);
+        RIPEMD160Digest digest = new RIPEMD160Digest();
+        digest.update(sha256, 0, sha256.length);
+        byte[] out = new byte[20];
+        digest.doFinal(out, 0);
+        return out;
+    }
+}
diff --git a/src/main/java/org/fisco/bcos/web3j/tx/txdecode/TransactionDecoder.java b/src/main/java/org/fisco/bcos/web3j/tx/txdecode/TransactionDecoder.java
index 1f804e17e..82fc2e638 100644
--- a/src/main/java/org/fisco/bcos/web3j/tx/txdecode/TransactionDecoder.java
+++ b/src/main/java/org/fisco/bcos/web3j/tx/txdecode/TransactionDecoder.java
@@ -31,20 +31,22 @@ public class TransactionDecoder {
 
     private String abi = "";
     private String bin = "";
+    private Boolean isSm = false;
     private Map<String, AbiDefinition> methodIDMap;
 
     public TransactionDecoder(String abi) {
-        this(abi, "");
+        this(abi, "", false);
     }
 
-    public TransactionDecoder(String abi, String bin) {
+    public TransactionDecoder(String abi, String bin, Boolean isSm) {
         this.abi = abi;
         this.bin = bin;
+        this.isSm = isSm;
         methodIDMap = new HashMap<String, AbiDefinition>();
         List<AbiDefinition> funcAbiDefinitionList = ContractAbiUtil.getFuncAbiDefinition(abi);
         for (AbiDefinition abiDefinition : funcAbiDefinitionList) {
             String methodSign = decodeMethodSign(abiDefinition);
-            String methodID = FunctionEncoder.buildMethodId(methodSign);
+            String methodID = FunctionEncoder.buildMethodId(methodSign, isSm);
             methodIDMap.put(methodID, abiDefinition);
         }
     }
diff --git a/src/main/java/org/fisco/bcos/web3j/tx/txdecode/TransactionDecoderFactory.java b/src/main/java/org/fisco/bcos/web3j/tx/txdecode/TransactionDecoderFactory.java
index 8d3c041cb..8c28f192d 100644
--- a/src/main/java/org/fisco/bcos/web3j/tx/txdecode/TransactionDecoderFactory.java
+++ b/src/main/java/org/fisco/bcos/web3j/tx/txdecode/TransactionDecoderFactory.java
@@ -19,10 +19,11 @@ public class TransactionDecoderFactory {
     /**
      * @param abi
      * @param bin
+     * @param isSm 是否国密；true：国密；false：非国密，ECDSA
      * @return TransactionDecoder
      */
-    public static TransactionDecoder buildTransactionDecoder(String abi, String bin) {
-        return new TransactionDecoder(abi, bin);
+    public static TransactionDecoder buildTransactionDecoder(String abi, String bin, Boolean isSm) {
+        return new TransactionDecoder(abi, bin, isSm);
     }
 
     /**