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In order to reduce the error due to the signal attenuation in complex electromagnetic environment, the multi sensor beacons localization algorithm based on RSSI was introduced. Firstly, the unknown sensor node’s initial location can be done with the weighted centroid algorithm for triangle. Second, the final location information was modified by the modification algorithm. The simulation experiments show that the algorithm of multi-sensors centroid localization and modification based on RSSI has improved the positioning accuracy by 13.8% more than traditional centroid localization algorithm, by 6.3% more than RSSI-based weighting centroid localization algorithm.