In view of the fact that the original support scheme of auxiliary transportation roadway in 071602 working face can not effectively control the floor heave of roadway, the scheme of "floor grouting + grouting bolt (cable) combined support" is put forward on the basis of the original support scheme. Firstly, the deformation and failure mechanism of roadway floor heave is analyzed and determined, and the "composite beam" model of anchored layered floor is established. It is determined that the roadway floor heave has a negative correlation with the surrounding rock stiffness of the floor, and a positive correlation with horizontal lateral pressure and vertical uniformly distributed load. The change of elastic modulus before and after the optimization of the support scheme is calculated, and the support stress of the optimized support scheme is 0.44MPa higher than that of the original support scheme. The range of stable area with small deformation is increased by about 1 times. In practice, the displacement of roof and floor and the deformation of the two sides of the optimized support scheme are reduced by 1099mm and 503mm respectively compared with the original support scheme. The optimal support scheme can better control the floor heave deformation.