diff --git a/src/enclave/persistence/Persistence.cpp b/src/enclave/persistence/Persistence.cpp
index 7568303b..dabc3c89 100644
--- a/src/enclave/persistence/Persistence.cpp
+++ b/src/enclave/persistence/Persistence.cpp
@@ -5,6 +5,8 @@
 
 using namespace std;
 
+void inner_ocall_persist_get(crust_status_t* crust_status, const char *key, uint8_t **value, size_t *value_len);
+
 /**
  * @description: Add value by key
  * @param key -> Pointer to key
@@ -129,6 +131,24 @@ crust_status_t persist_set(std::string key, const uint8_t *value, size_t value_l
     }
     else
     {
+        // Delete old data
+        std::string sum_key = key + "_sum";
+        uint8_t *p_sum_key = NULL;
+        size_t sum_key_len = 0;
+        inner_ocall_persist_get(&crust_status, sum_key.c_str(), &p_sum_key, &sum_key_len);
+        if (CRUST_SUCCESS == crust_status)
+        {
+            json::JSON sum_json = json::JSON::Load(std::string(reinterpret_cast<char *>(p_sum_key), sum_key_len));
+            free(p_sum_key);
+            uint32_t piece_num = sum_json[PERSIST_SUM].ToInt();
+            for (uint32_t i = 0; i < piece_num; i++)
+            {
+                std::string del_key = key + "_" + std::to_string(i);
+                persist_del(del_key);
+            }
+            persist_del(sum_key);
+        }
+        // Set new data
         ocall_persist_set(&crust_status, key.c_str(), (uint8_t *)p_sealed_data, sealed_data_size);
     }
 
@@ -178,6 +198,24 @@ crust_status_t persist_set_unsafe(std::string key, const uint8_t *value, size_t
     }
     else
     {
+        // Delete old data
+        std::string sum_key = key + "_sum";
+        uint8_t *p_sum_key = NULL;
+        size_t sum_key_len = 0;
+        inner_ocall_persist_get(&crust_status, sum_key.c_str(), &p_sum_key, &sum_key_len);
+        if (CRUST_SUCCESS == crust_status)
+        {
+            json::JSON sum_json = json::JSON::Load(std::string(reinterpret_cast<char *>(p_sum_key), sum_key_len));
+            free(p_sum_key);
+            uint32_t piece_num = sum_json[PERSIST_SUM].ToInt();
+            for (uint32_t i = 0; i < piece_num; i++)
+            {
+                std::string del_key = key + "_" + std::to_string(i);
+                persist_del(del_key);
+            }
+            persist_del(sum_key);
+        }
+        // Set new data
         ocall_persist_set(&crust_status, key.c_str(), value, value_len);
     }
 
diff --git a/src/enclave/storage/Storage.cpp b/src/enclave/storage/Storage.cpp
index 982b6a57..9d45a3cc 100644
--- a/src/enclave/storage/Storage.cpp
+++ b/src/enclave/storage/Storage.cpp
@@ -87,6 +87,8 @@ crust_status_t storage_seal_file(const char *p_tree, size_t tree_len, const char
     file_entry_json[FILE_BLOCK_NUM] = block_num;
     // Status indicates current new file's status, which must be one of valid, lost and unconfirmed
     file_entry_json[FILE_STATUS] = FILE_STATUS_UNCONFIRMED;
+    free(new_root_hash_u);
+    free(org_root_hash_u);
 
     // Store new tree structure
     crust_status = persist_set_unsafe(new_root_hash_str, (const uint8_t*)new_tree.c_str(), new_tree.size());
diff --git a/src/enclave/workload/Workload.cpp b/src/enclave/workload/Workload.cpp
index e52e132e..dd71225e 100644
--- a/src/enclave/workload/Workload.cpp
+++ b/src/enclave/workload/Workload.cpp
@@ -354,5 +354,9 @@ void Workload::set_srd_info(std::string path, long change)
  */
 json::JSON Workload::get_srd_info()
 {
-    return this->srd_info_json;
+    sgx_thread_mutex_lock(&this->srd_info_mutex);
+    json::JSON srd_info = this->srd_info_json;
+    sgx_thread_mutex_unlock(&this->srd_info_mutex);
+
+    return srd_info;
 }
diff --git a/test/integration/performance/run_test.sh b/test/integration/performance/run_test.sh
index cc23f8af..a209be8e 100755
--- a/test/integration/performance/run_test.sh
+++ b/test/integration/performance/run_test.sh
@@ -1,14 +1,23 @@
 #!/bin/bash
 function _seal()
 {
+    echo 0 > $sealsyncfile
     file_num_g=0
     local total_num=$(get_config ".performance|.file_num")
     while true; do
         sleep 3
         if [ $file_num_g -lt $total_num ]; then
             local num=1000
-            while [ $num -ge 0 ]; do
-                _seal_r
+            while [ $num -ge 0 ] && [ $(cat $sealsyncfile) -lt 10 ]; do
+                (
+                  flock -w 30 202
+                  if [ $(cat $sealsyncfile) -lt 10 ]; then
+                      _seal_r &
+                      local cur_num=$(cat $sealsyncfile)
+                      ((cur_num++))
+                      echo $cur_num > $sealsyncfile
+                  fi
+                ) 202>$seallockfile
                 ((num--))
             done
         fi
@@ -295,6 +304,8 @@ srdresfile=$ptmpdir/srd_info
 deletefilethres=3
 deletetime=100
 deletelockfile=$ptmpdir/deletelockfile
+seallockfile=$ptmpdir/seallockfile
+sealsyncfile=$ptmpdir/sealsyncfile
 
 # Control sig num
 sigShowInfo=28
diff --git a/test/integration/scripts/start_test.sh b/test/integration/scripts/start_test.sh
index bd9c9234..5a4f203c 100755
--- a/test/integration/scripts/start_test.sh
+++ b/test/integration/scripts/start_test.sh
@@ -114,7 +114,7 @@ fi
 ### Start crust-sworker
 cd $testdir
 rm -rf tee_base_path
-rm -rf files/*
+rm -rf files
 verbose INFO "starting crust-sworker..." h
 ./bin/crust-sworker -c etc/Config.json --offline --debug &>$sworkerlog &
 pid=$!
diff --git a/test/integration/scripts/utils.sh b/test/integration/scripts/utils.sh
index 7e5a6733..ce31ceee 100755
--- a/test/integration/scripts/utils.sh
+++ b/test/integration/scripts/utils.sh
@@ -81,6 +81,7 @@ function seal_file()
 {
     local data_path=$1
     local store_path=$2
+    store_path=${store_path}.$RANDOM
     local tmp_file=tmp_file.$RANDOM
 
     ### Split file