diff --git a/common/src/hcf_parcel.c b/common/src/hcf_parcel.c
index fa8b56e6666c4b6fd651460fc247f5ad82f4ecc0..739868c8dce8e9d2d9e66161185259cdd34a7f38 100644
--- a/common/src/hcf_parcel.c
+++ b/common/src/hcf_parcel.c
@@ -87,7 +87,6 @@ static bool ParcelRealloc(HcParcel *parcel, uint32_t size)
         return false;
     }
     HcfFree(parcel->data);
-    parcel->data = NULL;
     parcel->data = newData;
     parcel->length = size;
     return true;
diff --git a/frameworks/cj/src/asy_key_generator_impl.cpp b/frameworks/cj/src/asy_key_generator_impl.cpp
index c34fbc3cb2b0a6b21aa473e7b3bd3ed2d559a271..2e6663991a8cf75559dfc5dbf3a9a7f82b13065a 100644
--- a/frameworks/cj/src/asy_key_generator_impl.cpp
+++ b/frameworks/cj/src/asy_key_generator_impl.cpp
@@ -24,7 +24,6 @@ AsyKeyGeneratorImpl::AsyKeyGeneratorImpl(HcfAsyKeyGenerator *generator)
 AsyKeyGeneratorImpl::~AsyKeyGeneratorImpl()
 {
     HcfObjDestroy(this->generator_);
-    this->generator_ = nullptr;
 }
 
 HcfAsyKeyGenerator *AsyKeyGeneratorImpl::GetAsyKeyGenerator()
diff --git a/frameworks/cj/src/cipher_impl.cpp b/frameworks/cj/src/cipher_impl.cpp
index e240b5325f3b3e67bde67fccfef4a278a3f64a39..44fc470be8e9c2a33145fb7e145286bb2af71b7a 100644
--- a/frameworks/cj/src/cipher_impl.cpp
+++ b/frameworks/cj/src/cipher_impl.cpp
@@ -25,7 +25,6 @@ namespace OHOS {
         CipherImpl::~CipherImpl()
         {
             HcfObjDestroy(this->cipher_);
-            this->cipher_ = nullptr;
         }
 
         HcfResult CipherImpl::CipherInit(HcfCryptoMode opMode, HcfKey *key, HcfParamsSpec *params)
diff --git a/frameworks/cj/src/crypto_ffi.cpp b/frameworks/cj/src/crypto_ffi.cpp
index fd803f23e510487ea89456386e9b9daa01fd6114..75e038f69f488f2ff4ed26fcb064338eb21b8d0c 100644
--- a/frameworks/cj/src/crypto_ffi.cpp
+++ b/frameworks/cj/src/crypto_ffi.cpp
@@ -431,7 +431,6 @@ namespace OHOS {
                     authTag.data = static_cast<uint8_t *>(HcfMalloc(GCM_AUTH_TAG_LEN, 0));
                     if (authTag.data == nullptr) {
                         HcfFree(gcmParamsSpec);
-                        gcmParamsSpec = nullptr;
                         return HCF_INVALID_PARAMS;
                     }
                     authTag.len = GCM_AUTH_TAG_LEN;
@@ -476,7 +475,6 @@ namespace OHOS {
                     authTag.data = static_cast<uint8_t *>(HcfMalloc(CCM_AUTH_TAG_LEN, 0));
                     if (authTag.data == nullptr) {
                         HcfFree(ccmParamsSpec);
-                        ccmParamsSpec = nullptr;
                         return HCF_INVALID_PARAMS;
                     }
                     authTag.len = CCM_AUTH_TAG_LEN;
diff --git a/frameworks/cj/src/mac_impl.cpp b/frameworks/cj/src/mac_impl.cpp
index d9079c284b5cb2326b03bf7c5e005f58c597d727..eb27e3aea052df4ce84d70d76ee2490132c77bd2 100644
--- a/frameworks/cj/src/mac_impl.cpp
+++ b/frameworks/cj/src/mac_impl.cpp
@@ -25,7 +25,6 @@ namespace OHOS {
         MacImpl::~MacImpl()
         {
             HcfObjDestroy(this->macObj_);
-            this->macObj_ = nullptr;
         }
 
         HcfResult MacImpl::MacInit(HcfSymKey *symKey)
diff --git a/frameworks/cj/src/md_impl.cpp b/frameworks/cj/src/md_impl.cpp
index 747dae76d4bb83e3eb32ffea7b2244763f58736b..543a3b07435e5b55b0a25db7ba812ca0274eb88f 100644
--- a/frameworks/cj/src/md_impl.cpp
+++ b/frameworks/cj/src/md_impl.cpp
@@ -34,7 +34,6 @@ namespace OHOS {
         MdImpl::~MdImpl()
         {
             HcfObjDestroy(this->mdObj_);
-            this->mdObj_ = nullptr;
         }
 
         HcfResult MdImpl::MdDoFinal(HcfBlob *output)
diff --git a/frameworks/cj/src/random_impl.cpp b/frameworks/cj/src/random_impl.cpp
index b4e2155fec076e247e6075aa913f23be4d3a430b..c97b2ab4bdb220dae75e62d177747cc15b9b1554 100644
--- a/frameworks/cj/src/random_impl.cpp
+++ b/frameworks/cj/src/random_impl.cpp
@@ -24,7 +24,6 @@ namespace OHOS {
         RandomImpl::~RandomImpl()
         {
             HcfObjDestroy(this->randObj_);
-            this->randObj_ = nullptr;
         }
 
         const char* RandomImpl::GetAlgName(int32_t* errCode)
diff --git a/frameworks/cj/src/sign_impl.cpp b/frameworks/cj/src/sign_impl.cpp
index 6db3450e706fadd4e4cec0e9f48931b244b593d7..719e168f883347888253039e2b9920bb28a31697 100644
--- a/frameworks/cj/src/sign_impl.cpp
+++ b/frameworks/cj/src/sign_impl.cpp
@@ -25,7 +25,6 @@ SignImpl::SignImpl(HcfSign *signObj)
 SignImpl::~SignImpl()
 {
     HcfObjDestroy(this->signObj_);
-    this->signObj_ = nullptr;
 }
 
 HcfResult SignImpl::Init(HcfPriKey *priKey)
diff --git a/frameworks/cj/src/sym_key_generator_impl.cpp b/frameworks/cj/src/sym_key_generator_impl.cpp
index a60408194fe11ec5883f4c37953cb92ac9e4ea80..9d13539480ec00c26aaa3b5f639ff474f9603d52 100644
--- a/frameworks/cj/src/sym_key_generator_impl.cpp
+++ b/frameworks/cj/src/sym_key_generator_impl.cpp
@@ -24,7 +24,6 @@ namespace OHOS {
         SymKeyGeneratorImpl::~SymKeyGeneratorImpl()
         {
             HcfObjDestroy(this->generator_);
-            this->generator_ = nullptr;
         }
 
         const char *SymKeyGeneratorImpl::GetAlgName(int32_t* errCode)
diff --git a/frameworks/cj/src/verify_impl.cpp b/frameworks/cj/src/verify_impl.cpp
index ccdd3622853662c30456428038427a6bc4ae63bd..1c9c0db290d3ba46c4a9b960454ec3fd1650d4a1 100644
--- a/frameworks/cj/src/verify_impl.cpp
+++ b/frameworks/cj/src/verify_impl.cpp
@@ -25,7 +25,6 @@ VerifyImpl::VerifyImpl(HcfVerify *verify)
 VerifyImpl::~VerifyImpl()
 {
     HcfObjDestroy(this->verify_);
-    this->verify_ = nullptr;
 }
 
 HcfResult VerifyImpl::Init(HcfPubKey *pubKey)
diff --git a/frameworks/js/napi/crypto/src/napi_pri_key.cpp b/frameworks/js/napi/crypto/src/napi_pri_key.cpp
index 6c460b1b0f0d2ad8396d5b77be6c0c9d0d218565..ec077ca7b96e0ec94d7a9888e0a2453fdd182c1f 100644
--- a/frameworks/js/napi/crypto/src/napi_pri_key.cpp
+++ b/frameworks/js/napi/crypto/src/napi_pri_key.cpp
@@ -164,7 +164,6 @@ napi_value NapiPriKey::JsGetEncodedPem(napi_env env, napi_callback_info info)
     HcfParamsSpec *paramsSpec = nullptr;
     NapiPriKey *napiPriKey = nullptr;
     if (!ValidateAndGetParams(env, info, format, &paramsSpec, &napiPriKey)) {
-        paramsSpec = nullptr;
         return NapiGetNull(env);
     }
 
diff --git a/frameworks/native/src/asym_key.c b/frameworks/native/src/asym_key.c
index 7efd8800a5adfc71ee61b8e4a0c1aab7171c687e..55494d5255a5caabed1d7d59653172798a3cdcd8 100644
--- a/frameworks/native/src/asym_key.c
+++ b/frameworks/native/src/asym_key.c
@@ -434,12 +434,10 @@ OH_Crypto_ErrCode OH_CryptoPrivKeyEncodingParams_SetParam(OH_CryptoPrivKeyEncodi
     switch (type) {
         case CRYPTO_PRIVATE_KEY_ENCODING_PASSWORD_STR:
             HcfFree(ctx->password);
-            ctx->password = NULL;
             ctx->password = data;
             break;
         case CRYPTO_PRIVATE_KEY_ENCODING_SYMMETRIC_CIPHER_STR:
             HcfFree(ctx->cipher);
-            ctx->cipher = NULL;
             ctx->cipher = data;
             break;
         default:
diff --git a/frameworks/native/src/crypto_asym_cipher.c b/frameworks/native/src/crypto_asym_cipher.c
index 5c9e53744d80d35d109de7de3b89066bf6b76ce9..9bc140e6674426c42ee3ee5d2b9095bb3e06d596 100644
--- a/frameworks/native/src/crypto_asym_cipher.c
+++ b/frameworks/native/src/crypto_asym_cipher.c
@@ -178,25 +178,21 @@ OH_Crypto_ErrCode OH_CryptoSm2CiphertextSpec_SetItem(OH_CryptoSm2CiphertextSpec
     switch (item) {
         case CRYPTO_SM2_CIPHERTEXT_C1_X:
             HcfFree(spec->xCoordinate.data);
-            spec->xCoordinate.data = NULL;
             spec->xCoordinate.data = data;
             spec->xCoordinate.len = in->len;
             break;
         case CRYPTO_SM2_CIPHERTEXT_C1_Y:
             HcfFree(spec->yCoordinate.data);
-            spec->yCoordinate.data = NULL;
             spec->yCoordinate.data = data;
             spec->yCoordinate.len = in->len;
             break;
         case CRYPTO_SM2_CIPHERTEXT_C2:
             HcfFree(spec->cipherTextData.data);
-            spec->cipherTextData.data = NULL;
             spec->cipherTextData.data = data;
             spec->cipherTextData.len = in->len;
             break;
         case CRYPTO_SM2_CIPHERTEXT_C3:
             HcfFree(spec->hashData.data);
-            spec->hashData.data = NULL;
             spec->hashData.data = data;
             spec->hashData.len = in->len;
             break;
diff --git a/plugin/mbedtls_plugin/rand/src/mbedtls_rand.c b/plugin/mbedtls_plugin/rand/src/mbedtls_rand.c
index ccc959de2a430caffeea145c0a8933e83da6a7b2..0ab9714b54667de03ace063f5eae912d0401bc16 100644
--- a/plugin/mbedtls_plugin/rand/src/mbedtls_rand.c
+++ b/plugin/mbedtls_plugin/rand/src/mbedtls_rand.c
@@ -140,7 +140,7 @@ static void DestroyMbedtlsRand(HcfObjectBase *self)
     if (ctrDrbg != NULL) {
         mbedtls_ctr_drbg_free(ctrDrbg);
         HcfFree(ctrDrbg);
-        ctxDrbg = NULL;
+        ctrDrbg = NULL;
     }
     mbedtls_entropy_context *entropy = MbedtlsGetMdEntropy((HcfRandSpi *)self);
     if (entropy != NULL) {