随着移动终端和移动互联网的发展，人们对于基于位置信息的服务的需求日益增大。相比室外环境可以采用GPS定位方法，在室内环境下，精确定位比较困难。本文描述了一种基于点对点辅助室内定位方法。该方法利用室外移动智能终端的GPS获得精准基准点并通过RSSI协助室内移动智能终端实现定位。该文详细地分析了该室内定位方法的工作原理，并给出了详细的设计方案。实验结果表明，该方法具有较高的可行性。<br/>With the rapid development of mobile smart device and mobile Internet, people’s demand for location-based services is increasing. Compared to the outdoor environment using GPS, precise positioning is more difficult in indoor environment. This paper describes the indoor localization method based on peer-to-peer auxiliary. The method utilizes GPS of outdoor smart devices to get accurate datum point, and implements localization by RSSI assisting the indoor smart devices. This paper analyzes the principle of the indoor localization method, and gives a detailed solution. Experimental results show that the method is of high feasibility.