Abstract: Aimming at the present states of ground subsidence happening in western part of Chenchao Iron Mine, with the informations on geology, engineering and geohydrology, the paper hasprobed into the mechanism of ground subsidence.Based on the analysis of influent coupling in this paper, at first discusses the rules of ground subsidence; then digital processing the monitoring data; finally, it puts forward the technique of mine -monitoring information technology based on GIS and its possible application.