diff --git a/components/finsh/cmd.c b/components/finsh/cmd.c
index 9197c90ad1cfad9416fb53f2503a73d51e18f9b7..995ec2a10917bc11a5fe6f161d0210b8fe4740b6 100644
--- a/components/finsh/cmd.c
+++ b/components/finsh/cmd.c
@@ -49,19 +49,6 @@
 #include <rtthread.h>
 #include "finsh.h"
 
-rt_inline unsigned int rt_list_len(const rt_list_t *l)
-{
-    unsigned int len = 0;
-    const rt_list_t *p = l;
-    while (p->next != l)
-    {
-        p = p->next;
-        len ++;
-    }
-
-    return len;
-}
-
 long hello(void)
 {
     rt_kprintf("Hello RT-Thread!\n");
diff --git a/include/rtservice.h b/include/rtservice.h
index 0ace555cdc262bb05c21ef29455faf9d2b927558..2c6682076dc603d1ad3e24eb00fb46fd78bf6c24 100644
--- a/include/rtservice.h
+++ b/include/rtservice.h
@@ -104,6 +104,23 @@ rt_inline int rt_list_isempty(const rt_list_t *l)
     return l->next == l;
 }
 
+/**
+ * @brief get the list length
+ * @param l the list to get.
+ */
+rt_inline unsigned int rt_list_len(const rt_list_t *l)
+{
+    unsigned int len = 0;
+    const rt_list_t *p = l;
+    while (p->next != l)
+    {
+        p = p->next;
+        len ++;
+    }
+
+    return len;
+}
+
 /**
  * @brief get the struct for this entry
  * @param node the entry point
@@ -177,6 +194,19 @@ rt_inline rt_slist_t *rt_slist_remove(rt_slist_t *l, rt_slist_t *n)
     return l;
 }
 
+rt_inline unsigned int rt_slist_len(const rt_slist_t *l)
+{
+    unsigned int len = 0;
+    const rt_slist_t *list = l->next;
+    while (list != RT_NULL)
+    {
+        list = list->next;
+        len ++;
+    }
+
+    return len;
+}
+
 /**
  * @brief get the struct for this single list node
  * @param node the entry point