diff --git a/HISTORY b/HISTORY
index 20ebb69..5be34f3 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,5 +1,5 @@
 
-Version 1.44  2020-05-07
+Version 1.44  2020-05-21
   * add test file src/tests/test_pthread_lock.c
   * add uniq_skiplist.[hc]
   * add function split_string_ex
@@ -29,6 +29,7 @@ Version 1.44  2020-05-07
   * connection_pool support validate connection on error
   * fast_task_queue.[hc]: free_queue support init_callback
   * ini_file_reader.c: use mutex lock when access dynamic content array
+  * uniq_skiplist add function uniq_skiplist_replace_ex
 
 Version 1.43  2019-12-25
   * replace function call system to getExecResult,
diff --git a/src/uniq_skiplist.c b/src/uniq_skiplist.c
index 27383de..807437c 100644
--- a/src/uniq_skiplist.c
+++ b/src/uniq_skiplist.c
@@ -447,7 +447,8 @@ static UniqSkiplistNode *uniq_skiplist_get_first_larger(
     return (UniqSkiplistNode *)previous->links[0];
 }
 
-int uniq_skiplist_delete(UniqSkiplist *sl, void *data)
+int uniq_skiplist_delete_ex(UniqSkiplist *sl, void *data,
+        const bool need_free)
 {
     int i;
     int level_index;
@@ -480,7 +481,7 @@ int uniq_skiplist_delete(UniqSkiplist *sl, void *data)
         }
     }
 
-    if (sl->factory->free_func != NULL) {
+    if (need_free && sl->factory->free_func != NULL) {
         sl->factory->free_func(deleted->data,
                 sl->factory->delay_free_seconds);
     }
@@ -490,6 +491,32 @@ int uniq_skiplist_delete(UniqSkiplist *sl, void *data)
     return 0;
 }
 
+int uniq_skiplist_replace_ex(UniqSkiplist *sl, void *data,
+        const bool need_free_old)
+{
+    int level_index;
+    UniqSkiplistNode *previous;
+    volatile UniqSkiplistNode *current;
+
+    previous = uniq_skiplist_get_equal_previous(sl, data, &level_index);
+    if (previous == NULL) {
+        return ENOENT;
+    }
+
+    current = previous->links[level_index];
+    if (need_free_old && sl->factory->free_func != NULL) {
+        void *deleted_data;
+
+        deleted_data = current->data;
+        current->data = data;
+        sl->factory->free_func(deleted_data, sl->factory->delay_free_seconds);
+    } else {
+        current->data = data;
+    }
+
+    return 0;
+}
+
 void *uniq_skiplist_find(UniqSkiplist *sl, void *data)
 {
     int level_index;
diff --git a/src/uniq_skiplist.h b/src/uniq_skiplist.h
index 35980d9..57d4ce1 100644
--- a/src/uniq_skiplist.h
+++ b/src/uniq_skiplist.h
@@ -70,6 +70,13 @@ extern "C" {
             compare_func, free_func, 64 * 1024, \
             SKIPLIST_DEFAULT_MIN_ALLOC_ELEMENTS_ONCE, 0)
 
+#define uniq_skiplist_delete(sl, data)  \
+    uniq_skiplist_delete_ex(sl, data, true)
+
+#define uniq_skiplist_replace(sl, data) \
+    uniq_skiplist_replace_ex(sl, data, true)
+
+
 int uniq_skiplist_init_ex2(UniqSkiplistFactory *factory,
         const int max_level_count, skiplist_compare_func compare_func,
         uniq_skiplist_free_func free_func, const int alloc_skiplist_once,
@@ -84,7 +91,10 @@ UniqSkiplist *uniq_skiplist_new(UniqSkiplistFactory *factory,
 void uniq_skiplist_free(UniqSkiplist *sl);
 
 int uniq_skiplist_insert(UniqSkiplist *sl, void *data);
-int uniq_skiplist_delete(UniqSkiplist *sl, void *data);
+int uniq_skiplist_delete_ex(UniqSkiplist *sl, void *data,
+        const bool need_free);
+int uniq_skiplist_replace_ex(UniqSkiplist *sl, void *data,
+        const bool need_free_old);
 void *uniq_skiplist_find(UniqSkiplist *sl, void *data);
 int uniq_skiplist_find_all(UniqSkiplist *sl, void *data,
         UniqSkiplistIterator *iterator);