  In this paper, we present a new model based on Quasi liquid layer to explain
why the direction of lateral motion of the curling rock on ice surface is
opposite to the other material surface. As we know, under the action of
inertial force, the pressure on the ice surface in front of curling is greater
than that on the back. So we assert that the firction coefficientin front of
curling is lower than that on the bank under different pressure. In order to
explain the pressure impact on friction coefficient, we qualitatively account
for the reason why the coefficient of friction increases under the pressure and
approximately calculated the relationship between the pressure and the
thickness of the quasi_liquid layer on the ice surface. Then we calculate the
function expression between temperature , pressure and the firction coefficient
by the function between temperature and friction coefficient.
