Abstract: The mining area of Pulang Copper mine has 5 large faults running through and many small faults interlacing with each other, which have great influence on the stability of bottom structure. In this paper, the ground pressure monitoring and analysis models was established for faults and their intersecting areas, and the ground pressure activity law of rock mass in the affected area of faults during mining was analyzed. The study shows that the microseismic event aggregation phenomenon is obvious in the fault area, the stress value of the pillar on the fault exposing line changes greatly, and the stress concentration phenomenon is easy to occur in the pillar in the fault crossing area. In order to improve stress concentration and local deformation of rock mass, targeted support measures was put forward.