The crack of secondary lining concrete is a problem that is easy to encounter during the operating pe- riod of highway tunnels. To solve this problem, a weak and crushing sandstone tunnel in the highway of Jiangxi Province was taken as an example. The 3D model of highway tunnel based on Cvisc creep model was established by using FLAC3D software, and the influence degree of wall rock creep on lining internal force was analyzed. Then the mechanical analysis was carried out based on the statistical results of the lining cracks’ law. The re- search results show that with the extension of the creep time of wall rock, the shear stress at arch foot and arch shoulder of lining is increased linearly. The increment of deviatoric stress at lining arch foot is the largest, fol- lowed by arch waist. After 10 years of wall rock creep, the maximum shear stress and deviatoric stress increment of lining are 2.11MPa and 1.3MPa respectively, reaching the allowable stress of lining concrete. So, the increase of shear stress and deviatoric stress has promoted the development of lining cracks.