In this paper, the theory developed in previous paper is extended to a thin superconducting film containing impurities. The critical magnetic field for the second order phase transition of the superconducting alloy film has been obtained. The results obtained are reduced to those of the Ginzburg-Landau theory when 2d 》ξ0 with arbitrary l or 2d《ξ0 with l《2d, but are different when 2d0 with l>2d, l being the mean free path of the electrons. The theory agrees with Blumberg's experiment.