提 要：杨鸿年、廖伯源通过对汉代宫省制度的研究，认为汉代宫省中存有一个三层宿卫体系，这一结论是我们理解汉代宫省宿卫制度的基础。由于宫省制度概念的模糊及考古材料的缺乏，二人的研究有相当的不确定性存在。结合汉长安城未央宫的发掘情况与文献记载，可以发现汉代宫省中实际存在一个四重宿卫体系，其中省中与禁中不同，而禁中是皇帝起居之处，是四层宿卫体系中最核心所在。

关键词：宿卫 宫省 禁中 省中 考古

Title: The Four Level Safeguarding System of the Han Palace

Author:Qu Bingrui, Doctoral Candidate, Department of History, Peking University, Beijing, 100871, China.

Abstract:Some researchers argued that the Han Palace was guarded by a three-level Security system. Based upon archaeological and historical evident, this paper points out that there was actually a four-level security system guarding the Han Palace.

Key words:Safeguarding system Han dynasty Archaeology