The deformation control method for large crosssection tunnels in mudstone ground is presented, with the construction of the entrance section of Hujiawan tunnel on LanzhouChongqing railway as an example. During construction, monitoring is executed to master the status of the rock mass deformation and temporary inverts and fanshaped supports are installed for the tunnel constructed by "top heading and bench" method so as to control the deformation. In the end, satisfactory results are achieved. The paper can be served as reference for the deformation control of the large crosssection tunnels on passengerdedicated railways.