Abstract: Previous location fingerprint matching algorithm have some problems of low positioning accuracy caused by huge calculating. This study proposed a joint algorithm based on received signal strength indication (RSSI). The joint algorithm integrate K nearest neighbor position fingerprint matching and triangulation auxiliary. Firstly, the positioning coordinates was obtained and modified by triangulation and then position fingerprint matching was conducted. This can improve the positioning accuracy. A software integrating location fingerprint collection and online positioning was developed using Android Studio in Java language and tested on the test site. The results show that the RSSI-based algorithm can resch positioning accuracy between 1 and 3 meters in 2D plane, which is higher than the single algorithm.