Abstract: In order to study mechanisms of floor heave of roadway, by the means of the theoretical analysis and simulation test, the five influence factors of floor heave were analyzed, including the structure and physical properties of the floor and the stress state of surrounding rock and the mining disturbance and the effect of the water and the supporting structure, the mechanism of floor heave of common roadway and dynamic pressure roadway. Based on these, more attention should be paid to achieve the floor heave of roadway in the future, such as the damage evolution and the stress distribution law of the nonlinear, mutational and strongly dynamic floor strata, controlling-timing and prevention of floor heave roadway.