diff --git a/src/config.c b/src/config.c
index d0b18c2..be3def9 100644
--- a/src/config.c
+++ b/src/config.c
@@ -1,6 +1,9 @@
 #include "config.h"
 
+#include <stdint.h>
 #include <stdio.h>
 
 /* 壁纸列表，支持通配符和 shell 环境变量拼接，最后以 NULL 结尾 */
 const char *wallpager_list[] = {NULL};
+/* 壁纸切换间隔（单位：秒），0 表示不切换 */
+const uint32_t wallpaper_interval = 0;
diff --git a/src/include/config.h b/src/include/config.h
index 0375e13..02cc801 100644
--- a/src/include/config.h
+++ b/src/include/config.h
@@ -1,3 +1,6 @@
 #pragma once
 
+#include <stdint.h>
+
 extern const char *wallpager_list[];
+extern const uint32_t wallpaper_interval;
diff --git a/src/main.c b/src/main.c
index 9d5ce4f..7c3ebe9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,6 @@
 #include <glib.h>
 #include <glibconfig.h>
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -15,6 +16,7 @@
 
 static void init_monitors(void);
 static void init_wallpaper(void);
+static gboolean update_wallpaper(gpointer user_data);
 static void set_wallpaper_by_index(uint32_t index);
 static wallpaper_config_t *parse_wallpaper_config(const char **wallpapers);
 static void free_wallpaper_config(wallpaper_config_t *wallpaper_config);
@@ -82,8 +84,28 @@ void init_monitors(void) {
 void init_wallpaper(void) {
   wallpaper_config = parse_wallpaper_config(wallpager_list);
   if (!wallpaper_config) return;
+  if (wallpaper_interval) {
+    g_timeout_add_seconds(wallpaper_interval, update_wallpaper,
+                          wallpaper_config);
+  }
 
-  set_wallpaper_by_index(0);
+  update_wallpaper(wallpaper_config);
+}
+
+gboolean update_wallpaper(gpointer user_data) {
+  wallpaper_config_t *wc = user_data;
+  if (!wc) return false;
+
+  static uint32_t index = 0;
+  set_wallpaper_by_index(index);
+  uint32_t monitor_count = 0;
+  for (monitor_t *m = monitors; m; m = m->next) monitor_count++;
+  if (monitor_count) {
+    index += monitor_count;
+    index %= wc->count;
+  }
+
+  return true;
 }
 
 void set_wallpaper_by_index(uint32_t index) {