Abstract:GPS and wireless base staion positioning system integrated in terminal equipment has the disadvantages of obvious positioning errors and drifts under the condition of weak or no signals in some areas. This paper presents the hybrid location algolrithm based on particle filter combining AGPS, wireless base staion location, and Pedestrian Dead Reckoning (PDR). The principle of the hybrid location algolrithm is carefully described. Experimental results show that the terminal equipment can be accurately positioned even under the condition of weak or no signals of GPS.