diff --git a/Changelog.md b/Changelog.md
index cd316c06..596b55e6 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,12 @@
+### v1.1.1
+
+(2021-04-02)
+
+**更改**
+
+* 升级web3sdk，修复偶现的断连问题
+* 优化区块头验证代码结构
+
 ### v1.1.0
 
 (2021-02-02)
@@ -27,7 +36,7 @@
     * 不允许call事务中的资源
     * 删除地址缓存，统一查CNS合约
     * 优化部分接口命名与定义
- 
+
 ### v1.0.0-rc4
 
 (2020-08-18)
diff --git a/build.gradle b/build.gradle
index 327b3f78..ed4ec0ef 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,7 +14,7 @@ plugins {
 apply plugin: 'com.github.johnrengelman.shadow'
 
 group 'com.webank.wecross'
-version '1.1.0'
+version '1.1.1'
 
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
@@ -73,7 +73,7 @@ dependencies {
     implementation 'com.google.guava:guava:30.1-jre'
     implementation 'org.yaml:snakeyaml:1.27'
 
-    implementation ('org.fisco-bcos:web3sdk:2.6.4.01220-SNAPSHOT')  {
+    implementation ('org.fisco-bcos:web3sdk:2.6.4-SNAPSHOT')  {
         exclude group: "org.ethereum"
         exclude group: "org.fisco-bcos", module: "tcnative"
         exclude group: "io.netty"
diff --git a/release_note.txt b/release_note.txt
index 795460fc..56130fb3 100644
--- a/release_note.txt
+++ b/release_note.txt
@@ -1 +1 @@
-v1.1.0
+v1.1.1
diff --git a/src/main/java/com/webank/wecross/stub/bcos/BCOSConnection.java b/src/main/java/com/webank/wecross/stub/bcos/BCOSConnection.java
index 0a55cf38..6901e53b 100644
--- a/src/main/java/com/webank/wecross/stub/bcos/BCOSConnection.java
+++ b/src/main/java/com/webank/wecross/stub/bcos/BCOSConnection.java
@@ -499,6 +499,7 @@ public void handleAsyncGetBlockRequest(Request request, Callback callback) {
                 List<String> headerData = new ArrayList<>();
                 headerData.add(objectMapper.writeValueAsString(blockHeader));
                 block.setExtraData(headerData);
+
                 if (logger.isDebugEnabled()) {
                     logger.debug("handleAsyncGetBlockRequest: block.Ext: {}", headerData);
                 }
diff --git a/src/main/java/com/webank/wecross/stub/bcos/BCOSDriver.java b/src/main/java/com/webank/wecross/stub/bcos/BCOSDriver.java
index e82f1d5e..bff6ba70 100644
--- a/src/main/java/com/webank/wecross/stub/bcos/BCOSDriver.java
+++ b/src/main/java/com/webank/wecross/stub/bcos/BCOSDriver.java
@@ -977,6 +977,7 @@ public void asyncGetBlock(
 
         String blockVerifierString = connection.getProperties().get(BCOSConstant.BCOS_SEALER_LIST);
         String nodeVersion = connection.getProperties().get(BCOSConstant.BCOS_NODE_VERSION);
+
         connection.asyncSend(
                 request,
                 response -> {
diff --git a/src/main/java/com/webank/wecross/stub/bcos/common/BCOSConstant.java b/src/main/java/com/webank/wecross/stub/bcos/common/BCOSConstant.java
index ce83495a..5f648307 100644
--- a/src/main/java/com/webank/wecross/stub/bcos/common/BCOSConstant.java
+++ b/src/main/java/com/webank/wecross/stub/bcos/common/BCOSConstant.java
@@ -19,6 +19,7 @@ public interface BCOSConstant {
     String BCOS_NODE_VERSION = "BCOS_PROPERTY_NODE_VERSION";
 
     String BCOS_SEALER_LIST = "VERIFIER";
+    int BCOS_NODE_ID_LENGTH = 128;
 
     String BCOS_PROXY_ABI = "WeCrossProxyABI";
     String BCOS_PROXY_NAME = StubConstant.PROXY_NAME;
diff --git a/src/main/java/com/webank/wecross/stub/bcos/config/BCOSStubConfig.java b/src/main/java/com/webank/wecross/stub/bcos/config/BCOSStubConfig.java
index 169163a5..6b8a9e3f 100644
--- a/src/main/java/com/webank/wecross/stub/bcos/config/BCOSStubConfig.java
+++ b/src/main/java/com/webank/wecross/stub/bcos/config/BCOSStubConfig.java
@@ -51,6 +51,7 @@ public static class ChannelService {
         private String sslCert;
         private String sslKey;
         private boolean gmConnectEnable;
+
         private String gmCaCert;
         private String gmSslCert;
         private String gmSslKey;
diff --git a/src/main/java/com/webank/wecross/stub/bcos/verify/BlockHeaderValidation.java b/src/main/java/com/webank/wecross/stub/bcos/verify/BlockHeaderValidation.java
index c1ed619f..37d3d1cb 100644
--- a/src/main/java/com/webank/wecross/stub/bcos/verify/BlockHeaderValidation.java
+++ b/src/main/java/com/webank/wecross/stub/bcos/verify/BlockHeaderValidation.java
@@ -6,6 +6,7 @@
 import com.webank.wecross.exception.WeCrossException;
 import com.webank.wecross.stub.ObjectMapperFactory;
 import com.webank.wecross.stub.bcos.common.BCOSBlockHeader;
+import com.webank.wecross.stub.bcos.common.BCOSConstant;
 import com.webank.wecross.stub.bcos.uaproof.Signer;
 import java.util.HashSet;
 import java.util.List;
@@ -34,6 +35,7 @@ public static void verifyBlockHeader(
                             + " actual stubType: "
                             + stubType);
         }
+
         List<String> sealerList = getPubKeyInBCOSVerifier(blockVerifierString);
 
         List<BcosBlockHeader.Signature> signatureList = bcosBlockHeader.getSignatureList();
@@ -133,7 +135,23 @@ private static List<String> getPubKeyInBCOSVerifier(String blockVerifierString)
             Map<String, Object> bcosVerifierMapper =
                     objectMapper.readValue(
                             blockVerifierString, new TypeReference<Map<String, Object>>() {});
-            return (List<String>) bcosVerifierMapper.get("pubKey");
+            List<String> pubKey = (List<String>) bcosVerifierMapper.get("pubKey");
+            if (pubKey == null) {
+                throw new WeCrossException(
+                        WeCrossException.ErrorCode.UNEXPECTED_CONFIG,
+                        "pubKey is null in BCOS Verifier.");
+            }
+            for (String key : pubKey) {
+                if (key.length() != BCOSConstant.BCOS_NODE_ID_LENGTH) {
+                    throw new WeCrossException(
+                            WeCrossException.ErrorCode.UNEXPECTED_CONFIG,
+                            "pubKey length is not in conformity with the BCOS right way, pubKey: "
+                                    + key
+                                    + " length is "
+                                    + key.length());
+                }
+            }
+            return pubKey;
         } catch (JsonProcessingException e) {
             throw new WeCrossException(
                     WeCrossException.ErrorCode.UNEXPECTED_CONFIG,
diff --git a/src/test/java/com/webank/wecross/stub/bcos/BCOSDriverTest.java b/src/test/java/com/webank/wecross/stub/bcos/BCOSDriverTest.java
index 4eecac43..5cc639fd 100644
--- a/src/test/java/com/webank/wecross/stub/bcos/BCOSDriverTest.java
+++ b/src/test/java/com/webank/wecross/stub/bcos/BCOSDriverTest.java
@@ -86,6 +86,7 @@ public void initializer() throws Exception {
                                 + "\"78a313b426c3de3267d72b53c044fa9fe70c2a27a00af7fea4a549a7d65210ed90512fc92b6194c14766366d434235c794289d66deff0796f15228e0e14a9191\","
                                 + "\"95b7ff064f91de76598f90bc059bec1834f0d9eeb0d05e1086d49af1f9c2f321062d011ee8b0df7644bd54c4f9ca3d8515a3129bbb9d0df8287c9fa69552887e\","
                                 + "\"b8acb51b9fe84f88d670646be36f31c52e67544ce56faf3dc8ea4cf1b0ebff0864c6b218fdcd9cf9891ebd414a995847911bd26a770f429300085f37e1131f36\"]}");
+
         connection.getProperties().put(BCOSConstant.BCOS_STUB_TYPE, "BCOS2.0");
         exceptionConnection =
                 BCOSConnectionFactory.build(bcosStubConfig, new Web3jWrapperWithExceptionMock());