Abstract：In order to reduce the hardware cost and improve the efficiency of the position,a method was proposed which combined the least square method and the weighted average. Some experimental data were obtained through the communication of beacon node,and then were handled by the least square method and the weighted average to calculate the path attenuation index and loss model,to achieve node localization accuracy.Experimental results show that the modified loss model which through above method not only could reduce the environmental factors affection but also more accurate than the traditional loss model.

Keyword：weirless sensor network;node localization;distance measurement based on RSSI;the least square algorithm;weighted average method;