Abstract: In order to solve the problem of east junggar coalfield extremely thick coal seam mining, comparative analysis of large mining height layered, layered large and fully mechanized mining caving combining three kinds of hierarchical caving mining method that B1 seam mining should be stratified caving, reasonable coal cutting height 5.0m or less, can be divided into three floors of exploitation, reducing the number of seams exposed repeatedly to reduce risk of spontaneous combustion in goaf, mining overburden may face control, spontaneous combustion, gas, equipment reliability and other issues, should strengthen prevention.