Abstract: For the characteristics of surrounding rock large deformation and severe floor heave of roadways under high horizontal stress, mechanical model of beam fixed at both ends is established, the critical axial stress formula of floor deformation failure is deduced, and the coefficient of floor deformation and destruction for clarifying the study on floor heave prevention and control mechanism with floor grooving is introduced. Based on this, floor heave control mechanism with floor grooving is proposed, that is, providing appropriate compensation space for surrounding rock, increasing its ability to absorb deformation, so as to reduce the floor heave. At the same time, by using the FLAC^3D software, two different calculation modes which are roadway floor without pressure-releasing groove and roadway floor with pressure-releasing groove are established, results show that the control effect of floor heave is obvious and the detrimental effect of the roadway roof and two sides are relatively small with the pressure-releasing groove under high horizontal stress. Therefore, from the view of ground control of roadways, floor grooving is an active measure to control floor heave under high horizontal stress.