After long-term sedimentary structure effect, the coal face roof rock itself appeares various fractures, owing to mine pressure appearence after mining the coal, parts of goaf overburden rock gradually become distortion,delamination even fall. Due to the collapse of roofs, formation of air disasters is related to the rock pressure and the surrounding rock movement law. Therefore, to master the law is a key factor of realizing mine safe and effictive production.This paper based on the background of one mine full-mechanized mining face in thin coal seam of 8214and used UDEC to study working face of first weighting interval , cycle weighting interval and fracture development. By analyzing the simulation results, it reflected the law of rock pressure and the surrounding rock movement. The conclusion provided a reference for knowing the problem of mine roof collapse in similar mine.