Abstract: The paper puts forward a kind of new mine personnel accurate position algorithm based on WI - FI, and introduces position system structure and signal propagation model,and gives a base station node preference method.Based on this, through the analysis of full intersection centroid localization algorithm, it gives full intersection weighted centroid positioning algorithm.In order to further improve positioning accuracy, the full intersection weighted centroid positioning algorithm was improved,and the paper puts forward a kind of new algorithm by using maximum likelihood estimation filter to achieve the optimization filter of RSSI values. Simulation experimental results show that the new algorithm is feasibility and superiority,and improves the positioning accuracy.