Abstract: Taking the floor heave at A504 roadway driven along next goaf in Xinjiang Sikeshu Coal Mine as an example, the strata displacement and stress distribution in roadway floor were studied by numerical simulation. The floor heave of shearing-slip and squeeze deformation was caused by concentrated high-stress in sides, high horizontal tectonic stress and intact rock in floor of roadway. On the basis of this, the design of cutting trough with orthogonal experiment in roadway floor was studied by numerical simulation, the reasonable and effective width and depth of cutting trough were selected, and the problem of floor heave in roadway was solved.