Abstract: Objective Indoor pedestrian localization is the key factor in Location Based Service(LBS)applications.Meanwhile,Pedestrian Dead-Reckoning(PDR)is an important method for indoor pedestrian localiza-tion,and vulnerable to the accumulate errors.This paper proposes a user activity awareness assistedindoor pedestrian localization method,in which an activity awareness technique is used to detect a us-er’s consecutive activities when the user passes special locations using the built-in sensors in smart-phones.Based on the location-related activities and indoor road network topology,the accumulatedPDR errors are eliminated by matching these consecutive activities to the special locations.Moreover,by the activity matching method,pedestrian autonomous localization can be realized when the startingpoint in unknown.Experimental results demonstrate the effectiveness of the proposed method.