diff --git a/deps/oblib/src/lib/alloc/memory_sanity.h b/deps/oblib/src/lib/alloc/memory_sanity.h
index 774f17c84d..404677a864 100644
--- a/deps/oblib/src/lib/alloc/memory_sanity.h
+++ b/deps/oblib/src/lib/alloc/memory_sanity.h
@@ -90,7 +90,7 @@ static inline void sanity_poison(const void *ptr, ssize_t len)
   if (!sanity_addr_in_range(ptr)) return;
   if (((uint64_t)ptr & 0x7) != 0) abort();
   char *shadow = (char*)sanity_to_shadow(ptr);
-  int32_t n_bytes = sanity_to_shadow_size(len);
+  int32_t n_bytes = static_cast<int32_t>(sanity_to_shadow_size(len));
   if (n_bytes > 0) {
     static void *(*real_memset)(void *, int, size_t)
       = (__typeof__(real_memset)) dlsym(RTLD_NEXT, "memset");
@@ -107,7 +107,7 @@ static inline void sanity_unpoison(const void *ptr, ssize_t len)
   if (!sanity_addr_in_range(ptr)) return;
   if (((uint64_t)ptr & 0x7) != 0) abort();
   char *shadow = (char*)sanity_to_shadow(ptr);
-  int32_t n_bytes = sanity_to_shadow_size(len);
+  int32_t n_bytes = static_cast<int32_t>(sanity_to_shadow_size(len));
   if (n_bytes > 0) {
     static void *(*real_memset)(void *, int, size_t)
       = (__typeof__(real_memset)) dlsym(RTLD_NEXT, "memset");
diff --git a/deps/oblib/src/lib/allocator/ob_asan_allocator.h b/deps/oblib/src/lib/allocator/ob_asan_allocator.h
index 2c32c7cf4b..1e9362c8c2 100644
--- a/deps/oblib/src/lib/allocator/ob_asan_allocator.h
+++ b/deps/oblib/src/lib/allocator/ob_asan_allocator.h
@@ -140,7 +140,7 @@ inline void *ObAsanAllocator::alloc(const int64_t size)
   void *buffer = ::malloc(real_size);
   if (OB_LIKELY(nullptr != buffer)) {
     AllocNode *new_node = new(buffer) AllocNode(this);
-    new_node->size_ = real_size;
+    new_node->size_ = static_cast<uint32_t>(real_size);
     ret = (void *)new_node->data_;
     add_node(new_node);
     alloc_bytes_ += real_size;
@@ -325,4 +325,4 @@ inline void ObParallelAsanAllocator::free(void *ptr)
 }
 }
 
-#endif // OCEANBASE_COMMON_ASAN_ALLOCATOR_H_
\ No newline at end of file
+#endif // OCEANBASE_COMMON_ASAN_ALLOCATOR_H_
diff --git a/src/share/backup/ob_archive_store.cpp b/src/share/backup/ob_archive_store.cpp
index 6902b4130f..0e4ad5c7c7 100644
--- a/src/share/backup/ob_archive_store.cpp
+++ b/src/share/backup/ob_archive_store.cpp
@@ -1460,7 +1460,7 @@ static int is_piece_start_file_name_(ObString &file_name, bool &is_piece_start)
   int ret = OB_SUCCESS;
   char tmp_str[OB_MAX_BACKUP_DEST_LENGTH] = { 0 };
   is_piece_start = false;
-  int32_t len = file_name.length() - strlen(OB_ARCHIVE_SUFFIX);
+  const int32_t len = static_cast<int32_t>(file_name.length() - strlen(OB_ARCHIVE_SUFFIX));
   if (file_name.empty()) {
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("empty file name", K(ret), K(file_name));
diff --git a/src/share/backup/ob_backup_data_store.cpp b/src/share/backup/ob_backup_data_store.cpp
index 17c2e84892..6bdd7c2ef6 100644
--- a/src/share/backup/ob_backup_data_store.cpp
+++ b/src/share/backup/ob_backup_data_store.cpp
@@ -939,7 +939,7 @@ int ObBackupDataStore::get_max_sys_ls_retry_id(const share::ObBackupPath &backup
   if (backup_path.is_empty() || !ls_id.is_valid()) {
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("get invalid args", K(ret), K(backup_path), K(ls_id));
-  } else if (OB_FAIL(prefix_op.init(sys_data_prefix, strlen(sys_data_prefix)))) {
+  } else if (OB_FAIL(prefix_op.init(sys_data_prefix, static_cast<int32_t>(strlen(sys_data_prefix))))) {
     LOG_WARN("failed to init dir prefix", K(ret), K(sys_data_prefix));
   } else if (OB_FAIL(util.list_directories(backup_path.get_obstr(), backup_set_dest_.get_storage_info(), prefix_op))) {
     LOG_WARN("failed to list files", K(ret), K(backup_path), K(backup_set_dest_));
diff --git a/src/share/inner_table/generate_inner_table_schema.py b/src/share/inner_table/generate_inner_table_schema.py
index e158590dc8..e0ffb37a07 100755
--- a/src/share/inner_table/generate_inner_table_schema.py
+++ b/src/share/inner_table/generate_inner_table_schema.py
@@ -164,7 +164,7 @@ def print_default_column(column_name, rowkey_id, index_id, part_key_pos, column_
     else:
       set_op = 'set_timestamp({0})'.format(default_value)
   elif column_type == 'ObLongTextType':
-    set_op = 'set_lob_value(ObLongTextType, "{0}", strlen("{0}"))'.format(default_value)
+    set_op = 'set_lob_value(ObLongTextType, "{0}", static_cast<int32_t>(strlen("{0}")))'.format(default_value)
     if column_collation_type == "CS_TYPE_BINARY":
       set_op += '; {0}_default.set_collation_type(CS_TYPE_BINARY);'.format(column_name.lower())
   else:
diff --git a/src/share/inner_table/ob_inner_table_schema.12301_12350.cpp b/src/share/inner_table/ob_inner_table_schema.12301_12350.cpp
index 7d9ffeca97..931194fd8a 100644
--- a/src/share/inner_table/ob_inner_table_schema.12301_12350.cpp
+++ b/src/share/inner_table/ob_inner_table_schema.12301_12350.cpp
@@ -1550,7 +1550,7 @@ int ObInnerTableSchema::all_virtual_restore_job_schema(ObTableSchema &table_sche
 
   if (OB_SUCC(ret)) {
     ObObj value_default;
-    value_default.set_lob_value(ObLongTextType, "", strlen(""));
+    value_default.set_lob_value(ObLongTextType, "", static_cast<int32_t>(strlen("")));
     ADD_COLUMN_SCHEMA_T("value", //column_name
       ++column_id, //column_id
       0, //rowkey_id
diff --git a/src/share/inner_table/ob_inner_table_schema.151_200.cpp b/src/share/inner_table/ob_inner_table_schema.151_200.cpp
index 6e812f26c8..bcb49c9769 100644
--- a/src/share/inner_table/ob_inner_table_schema.151_200.cpp
+++ b/src/share/inner_table/ob_inner_table_schema.151_200.cpp
@@ -2901,7 +2901,7 @@ int ObInnerTableSchema::all_restore_job_schema(ObTableSchema &table_schema)
 
   if (OB_SUCC(ret)) {
     ObObj value_default;
-    value_default.set_lob_value(ObLongTextType, "", strlen(""));
+    value_default.set_lob_value(ObLongTextType, "", static_cast<int32_t>(strlen("")));
     ADD_COLUMN_SCHEMA_T("value", //column_name
       ++column_id, //column_id
       0, //rowkey_id
diff --git a/src/share/inner_table/ob_inner_table_schema.401_450.cpp b/src/share/inner_table/ob_inner_table_schema.401_450.cpp
index 08b710a76d..9783f1e948 100644
--- a/src/share/inner_table/ob_inner_table_schema.401_450.cpp
+++ b/src/share/inner_table/ob_inner_table_schema.401_450.cpp
@@ -5787,7 +5787,7 @@ int ObInnerTableSchema::all_tenant_rewrite_rules_schema(ObTableSchema &table_sch
 
   if (OB_SUCC(ret)) {
     ObObj fixed_param_infos_default;
-    fixed_param_infos_default.set_lob_value(ObLongTextType, "", strlen(""));
+    fixed_param_infos_default.set_lob_value(ObLongTextType, "", static_cast<int32_t>(strlen("")));
     ADD_COLUMN_SCHEMA_T("fixed_param_infos", //column_name
       ++column_id, //column_id
       0, //rowkey_id
@@ -5806,7 +5806,7 @@ int ObInnerTableSchema::all_tenant_rewrite_rules_schema(ObTableSchema &table_sch
 
   if (OB_SUCC(ret)) {
     ObObj dynamic_param_infos_default;
-    dynamic_param_infos_default.set_lob_value(ObLongTextType, "", strlen(""));
+    dynamic_param_infos_default.set_lob_value(ObLongTextType, "", static_cast<int32_t>(strlen("")));
     ADD_COLUMN_SCHEMA_T("dynamic_param_infos", //column_name
       ++column_id, //column_id
       0, //rowkey_id
@@ -5825,7 +5825,7 @@ int ObInnerTableSchema::all_tenant_rewrite_rules_schema(ObTableSchema &table_sch
 
   if (OB_SUCC(ret)) {
     ObObj def_name_ctx_str_default;
-    def_name_ctx_str_default.set_lob_value(ObLongTextType, "", strlen(""));
+    def_name_ctx_str_default.set_lob_value(ObLongTextType, "", static_cast<int32_t>(strlen("")));
     ADD_COLUMN_SCHEMA_T("def_name_ctx_str", //column_name
       ++column_id, //column_id
       0, //rowkey_id