Abstract: Serious floor heave of the haulage tunnel at-785m level,that the maximum value arrives to 70cm,is a great problem in Kongzhuang coal mine,which impact the normal application of roadway severely.To analyse major control factors that lead to floor heave and research the mechanism of floor heave due to the physicomechanical properties,stress situation and mineral association of the surrounding rock,to put forward a control project that fix the anchor in the floor,and to optimize the design parameters based on the result of numerical simulation.Insitu measurement shows that good result of controlling the floor heave is obtained with the scheme.