Abstract: For the localization of nodes in WSN, a new sensor localization approach based on ROBRSSI(ring overlapping based on received signal strength indicator) using three beacons was presented. Designing the handling of error transforming and the collaboration between unknown nodes and their two-hop neighbors, the effect of measurement error of RSSI on localization accuracy as shown in earlier works is restrained efficiently with the requirement for the relative position between node and beacons reduced to implement the node's precise localization. Then, the localization of new comers in WSN is studied on the basis of ROBRSSI. Simulation results showed the validity and superiority of the algorithm.