diff --git a/examples/array/simple.c b/examples/array/simple.c
index e70fc9c0..630ec9c2 100644
--- a/examples/array/simple.c
+++ b/examples/array/simple.c
@@ -10,25 +10,29 @@
 
 #define TEST_LOOP 100
 #define TEST_SIZE 64
-BFDEV_DEFINE_ARRAY(test_array, NULL, TEST_SIZE);
 
 int
 main(int argc, const char *argv[])
 {
+    BFDEV_DEFINE_ARRAY(array, NULL, TEST_SIZE);
     unsigned int count;
-    void *array;
+
+    bfdev_array_append(&array, 0, 0);
 
     for (count = 0; count < TEST_LOOP; ++count) {
         unsigned int num;
+        void *buff;
 
         num = rand() % TEST_SIZE;
-        array = bfdev_array_push(&test_array, num);
-        memset(array, 0, TEST_SIZE * num);
+        buff = bfdev_array_push(&array, num);
+        if (!buff)
+            return 1;
 
-        printf("array bfdev_array_push test: %02u: %u\n",
-                count, num);
+        memset(buff, 0, TEST_SIZE * num);
+        printf("array bfdev_array_push test: %02u: %u\n", count, num);
     }
 
-    bfdev_array_release(&test_array);
+    bfdev_array_release(&array);
+
     return 0;
 }
diff --git a/include/bfdev/array.h b/include/bfdev/array.h
index c75153c0..960d1a2f 100644
--- a/include/bfdev/array.h
+++ b/include/bfdev/array.h
@@ -152,9 +152,9 @@ extern void *
 bfdev_array_peek(const bfdev_array_t *array, unsigned long num);
 
 /**
- * bfdev_array_append() - append memory into the array.
+ * bfdev_array_append() - append elements into the array.
  * @array: the array object.
- * @data: the data to append.
+ * @data: the elements to append.
  * @num: the number of element to append.
  *
  * Return 0 on success or a negative error code on failure.
@@ -162,6 +162,17 @@ bfdev_array_peek(const bfdev_array_t *array, unsigned long num);
 extern int
 bfdev_array_append(bfdev_array_t *array, const void *data, unsigned long num);
 
+/**
+ * bfdev_array_remove() - remove elements from the array.
+ * @array: the array object.
+ * @index: the index of the first elements to remove.
+ * @num: the number of element to remove.
+ *
+ * Return 0 on success or a negative error code on failure.
+ */
+extern int
+bfdev_array_remove(bfdev_array_t *array, unsigned long index, unsigned long num);
+
 /**
  * bfdev_array_resize() - directly set the number of elements in array.
  * @array: the array object.
diff --git a/include/bfdev/port/string.h b/include/bfdev/port/string.h
index fd100bbb..90f6ce86 100644
--- a/include/bfdev/port/string.h
+++ b/include/bfdev/port/string.h
@@ -14,6 +14,9 @@ BFDEV_BEGIN_DECLS
 extern void *
 bfdev_memcpy(void *dest, const void *src, bfdev_size_t n);
 
+extern void *
+bfdev_memmove(void *dest, const void *src, bfdev_size_t n);
+
 extern void *
 bfdev_memset(void *s, int c, bfdev_size_t n);
 
diff --git a/include/port/string.h b/include/port/string.h
index dcabeb28..27314c9e 100644
--- a/include/port/string.h
+++ b/include/port/string.h
@@ -14,6 +14,9 @@ BFDEV_BEGIN_DECLS
 extern void *
 bfport_memcpy(void *dest, const void *src, bfdev_size_t n);
 
+extern void *
+bfport_memmove(void *dest, const void *src, bfdev_size_t n);
+
 extern void *
 bfport_memset(void *s, int c, bfdev_size_t n);
 
diff --git a/port/generic/string.c b/port/generic/string.c
index 2f11acbb..ce22bfb7 100644
--- a/port/generic/string.c
+++ b/port/generic/string.c
@@ -21,6 +21,33 @@ bfport_memcpy(void *dest, const void *src, bfdev_size_t n)
     return dest;
 }
 
+__bfdev_weak void *
+bfport_memmove(void *dest, const void *src, bfdev_size_t n)
+{
+    char *tmp;
+    const char *s;
+
+    if (dest <= src) {
+        tmp = dest;
+        s = src;
+
+        while (n--)
+            *tmp++ = *s++;
+
+        return dest;
+    }
+
+    tmp = dest;
+    tmp += n;
+    s = src;
+    s += n;
+
+    while (n--)
+        *--tmp = *--s;
+
+    return dest;
+}
+
 __bfdev_weak void *
 bfport_memset(void *s, int c, bfdev_size_t n)
 {
@@ -41,7 +68,8 @@ bfport_memcmp(const void *s1, const void *s2, bfdev_size_t n)
 
     res = 0;
     for (su1 = s1, su2 = s2; 0 < n; ++su1, ++su2, n--) {
-        if ((res = *su1 - *su2) != 0)
+        res = *su1 - *su2;
+        if (res != 0)
             break;
     }
 
@@ -117,8 +145,7 @@ bfport_strcpy(char *dest, const char *src)
     unsigned char *tmp;
 
     tmp = dest;
-    while ((*tmp++ = *src++) != '\0')
-        ;
+    while ((*tmp++ = *src++) != '\0');
 
     return dest;
 }
diff --git a/port/posix/string.c b/port/posix/string.c
index 8c3f4c6e..28fee713 100644
--- a/port/posix/string.c
+++ b/port/posix/string.c
@@ -18,6 +18,12 @@ bfport_memcpy(void *dest, const void *src, bfdev_size_t n)
     return memcpy(dest, src, n);
 }
 
+void *
+bfport_memmove(void *dest, const void *src, bfdev_size_t n)
+{
+    return memmove(dest, src, n);
+}
+
 void *
 bfport_memset(void *s, int c, bfdev_size_t n)
 {
diff --git a/src/array.c b/src/array.c
index f6a4f3c5..3ce50de9 100644
--- a/src/array.c
+++ b/src/array.c
@@ -121,6 +121,34 @@ bfdev_array_append(bfdev_array_t *array, const void *data, unsigned long num)
     return -BFDEV_ENOERR;
 }
 
+export int
+bfdev_array_remove(bfdev_array_t *array, unsigned long index, unsigned long num)
+{
+    unsigned long cut;
+    void *start, *end;
+    bfdev_size_t behind;
+    bfdev_bool overflow;
+
+    if (bfdev_unlikely(index >= array->index))
+        return -BFDEV_EFBIG;
+
+    overflow = bfdev_overflow_check_add(index, num, &cut);
+    if (bfdev_unlikely(overflow))
+        return -BFDEV_EOVERFLOW;
+
+    if (bfdev_unlikely(cut > array->index))
+        return -BFDEV_EFBIG;
+
+    start = array->data + bfdev_array_offset(array, index);
+    end = array->data + bfdev_array_offset(array, cut);
+    behind = bfdev_array_offset(array, array->index - cut);
+
+    bfdev_memmove(start, end, behind);
+    array->index -= num;
+
+    return -BFDEV_ENOERR;
+}
+
 export int
 bfdev_array_resize(bfdev_array_t *array, unsigned long num)
 {
diff --git a/src/port/string.c b/src/port/string.c
index 51bd2676..64e44ea3 100644
--- a/src/port/string.c
+++ b/src/port/string.c
@@ -13,6 +13,12 @@ bfdev_memcpy(void *dest, const void *src, bfdev_size_t n)
     return bfport_memcpy(dest, src, n);
 }
 
+export void *
+bfdev_memmove(void *dest, const void *src, bfdev_size_t n)
+{
+    return bfport_memmove(dest, src, n);
+}
+
 export void *
 bfdev_memset(void *s, int c, bfdev_size_t n)
 {