Abstract: To solve the extrusion fluidity floor heave of roadway, the extrusion fluidity problem of floor heave in deep mine is simplified to a fixed compression bar stability, and we calculate a area under the floor heave of critical depth of H and the maximum heave y_x=L/2. Through the analysis, deep roadway floor heave has a tendency to increase than shallow, and through theoretical analysis, we proposed the coal wall, floor grouting and other methods to control the floor heave. These measures have been applied in the actual production,and achieved better control effect.