Aiming at issue that wireless sensor networks（ WSNs） is easy to be influenced by external factors

result in the problem that the anchor circles in trilateration have no intersection

a RSSI range-based modified localization algorithm is proposed. An overlapped region is formed by the correction of anchor circle radius

and then locates accurately the unknown node with the weighted centroid localization algorithm. The simulation and experimental results show that the proposed algorithm has better localization precision and than other localization methods

at range of 6 m × 10 m

average error of localization is 0. 62 m.