Frost-heave force is one of the main reasons to create disease of supporting structure in frozen soil tunnel; in order to master the distribution shape and the regularity as change as temperature of frost-heave force of Kunlun Mountain Tunnel in permefrast area

in-situ test was carried out. The research results show: by far

the whole supporting structure of Kunlun Mountain Tunnel was safe and reliable; frost-heave force was as change as temperature and season; the change would go to stabilize after 2004

the Max testing frost-heave force was 0.3 MPa

it located in the arch invert between surrounding rock and preliminary bracing; the frost-heave force between preliminary bracing and lining was very small; the supporting strength of lining would consider weaken properly; the frost-heave force envelope curve was plotted by using influence line theory; and it offers a proper and effective method to determine the most disadvantage load which act on the supporting structure.