Location estimation of distributed sensors is take great importance in Wireless Sensors Network (WSN) applications. This paper focus on Radio Signal Strength Indictor(RSSI) to estimate distance between two sensors since RSSI low cost and energy consumption. The main reductions suffered by signal are due to fading, multipath, shadowing and 'Large-scale' path loss. Path loss module calculated previously and fixed along processing time without take environment change into consideration. To deal with this problem this paper present a simple method based on the Weight Median Filter (WMF) clarified RSSI sample to overcome attenuation effect periodically.