Abstract: Metal mine ground cracks caused by underground mining become a serious of mine geological environment problems and appeal more and more attention. Jingerquan appeares quantities of ground fissures and lager area of ground collapse because it adopted short-hole shrinkage method in the early time. Afterwards, back filling method was adopted in order to protect from collapsing the building around the mining area. Based on the actual reconnaissance survey and long-term ground GPS monitoring data, the changing rules and formation mechanism of ground fissures are discussed from the forming and developing trend of surface crack. This article provids theory basis for the safety of mining production.