Abstract:In this paper, an electronic shopping guide system is designed which includes electronic tag selection, embedded Android system selection, and electronic shopping guide system function module. Also the paper designs the client's two function modules, including commodity promotional information function module, electronic map positioning module. The use of RSSI assesses received signal strength and calculates the RFID label and reader distance, got intelligent shopping cart position by using the maximum likelihood estimation method according to the four adjacent coordinates of the tag.