Abstract: According to the problem of rock burst and instability of floor in deep roadway, we analyze and compare the similarities and differences of sharp floor heave in soft and week floor and hard-brittle floor, and discuss the formation mechanism, evolution process and control principle of sharp floor heave in hard-brittle floor．The study shows that sharp floor heave of hard-brittle had experienced four main process: energy storage by deformation, energy release by crack evolution, migration and shock, lockout and stability. Floor structure transformed from "energy storage bow" to "wing block structure" with constantly adjusting and changing of energy operation mode of floor structure．It was a feasible way to control sharp floor heave of deep coal gateway by combining support pattern with pressure relief method．