Abstract: To study the deformation and movement and failure of overburden rock in skip tailings paste backfilling material mining, the paper established similar physical model based on similarity theory and studied the stability of coal pillars and backfill and the fracture and bending law of roof by background of 1021 working face in 102 mining area of Zhangzhao Coal Mine. The results showed that the immediate roof and main roof was basically stable and did not deform after the first round skip tailings paste backfilling material mining with mining 5 m and leaving 15 m coal pillars. With the increase in the number of coal pillars mined, the immediate roof sank obviously and the measuring point 1 to 8 which stayed 90 m from the opening showed that the sinking maximum was 4.5 cm after the second round excavating 80 m coal pillars. The overlying strata sinking maximum to be 22 cm and the height of abscission layer development was 29.4 m when the working surface was filled and mined completely. The suffered vertical stress of coal pillars and backfill became larger with the number of coal pillars recovered increasing. The change of monitoring data in coal pillars showed stepwise increase divided into three stages of mutation and slow growth and stable period. The force of backfill body was between 0.012 MPa and 0.02 MPa and the body had small deformation.