The calculating formula of shrinkage and tension stress of the pavement is set up on the basis of the friction between slab and base. The temperature of slab affected by the change of environment is analyzed and the calculating formulas of the stress distribution in day and year are deduced. The formulas can be used to calculate the shrinkage and tension stress of large size cement concrete pavement, and the correctness of the formula is verified by the test of large size pavement at a certain airfield.