diff --git a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA2048SignatureFunctionTest.java b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA2048SignatureFunctionTest.java
index 8b762ff9..9b6952be 100644
--- a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA2048SignatureFunctionTest.java
+++ b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA2048SignatureFunctionTest.java
@@ -9,9 +9,7 @@ import java.util.Random;
 import static com.jd.blockchain.crypto.CryptoAlgorithm.*;
 import static com.jd.blockchain.crypto.CryptoKeyType.PRIVATE;
 import static com.jd.blockchain.crypto.CryptoKeyType.PUBLIC;
-import static junit.framework.TestCase.assertNull;
 import static org.junit.Assert.*;
-import static org.junit.Assert.assertArrayEquals;
 
 /**
  * @author zhanglin33
diff --git a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA4096SignatureFunctionTest.java b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA4096SignatureFunctionTest.java
index 9ab2ac7c..5b976c72 100644
--- a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA4096SignatureFunctionTest.java
+++ b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SHA1WITHRSA4096SignatureFunctionTest.java
@@ -10,7 +10,6 @@ import static com.jd.blockchain.crypto.CryptoAlgorithm.ASYMMETRIC_KEY;
 import static com.jd.blockchain.crypto.CryptoAlgorithm.SIGNATURE_ALGORITHM;
 import static com.jd.blockchain.crypto.CryptoKeyType.PRIVATE;
 import static com.jd.blockchain.crypto.CryptoKeyType.PUBLIC;
-import static junit.framework.TestCase.assertNull;
 import static org.junit.Assert.*;
 
 /**
diff --git a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SM3WITHSM2SignatureFunctionTest.java b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SM3WITHSM2SignatureFunctionTest.java
index c9fa8311..0b8063a9 100644
--- a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SM3WITHSM2SignatureFunctionTest.java
+++ b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/service/pki/SM3WITHSM2SignatureFunctionTest.java
@@ -10,7 +10,6 @@ import static com.jd.blockchain.crypto.CryptoAlgorithm.ASYMMETRIC_KEY;
 import static com.jd.blockchain.crypto.CryptoAlgorithm.SIGNATURE_ALGORITHM;
 import static com.jd.blockchain.crypto.CryptoKeyType.PRIVATE;
 import static com.jd.blockchain.crypto.CryptoKeyType.PUBLIC;
-import static junit.framework.TestCase.assertNull;
 import static org.junit.Assert.*;
 
 /**
diff --git a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/utils/CertParserTest.java b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/utils/CertParserTest.java
index 7f106a2d..24cdc414 100644
--- a/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/utils/CertParserTest.java
+++ b/source/crypto/crypto-pki/src/test/java/com/jd/blockchain/crypto/utils/CertParserTest.java
@@ -1,6 +1,5 @@
 package com.jd.blockchain.crypto.utils;
 
-import org.bouncycastle.util.encoders.Hex;
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;