Abstract: For most of the current underground monitoring system can not provide accurate real-time downhole dynamic distribution of personnel and operations as well as the traditional location algorithm positioning accuracy and low，combined with the specific requirements of underground construction，design personnel positioning system based on improved weighted centroid algorithm.Software and hardware design of the system is described in detail，but for the shortcomings common centroid algorithm and the traditional weighted centroid algorithm is designed to improve the weighted centroid algorithm，using this algorithm to solve the coordinates of the location of the point，the experiment comparative analysis proved that the algorithm in large part to enhance the positioning accuracy.