Abstract: The effects of ice caps-temperature-albedo feedback on the global climate are studied with a time-dependent two-dimensional energy balance model. The existence of a steady-state solution is shown by numerical experiments. In contrast to the result of one-dimensional models used by other investigators, this steady-state solution corresponding to the observed solar constant is unique. If the ice ages should occur, i.e. ice edge reaching about 50°N, the solar constant would decrease about 17%.It is also found that even various parameters be changed about ±20%,the dependence of the latitude of ice edge on solar constant is almost invariable. This shows that the existing climate is fairly stable. Among the parameters influencing climate, the coefficient of turbulent exchange of heat in vertical directions and the absorption coefficients of radiation are most important ones. Therefore the vertical transport process of the energy may play a dominant role in determining climatic state. It is just such a process which was not taken into account in one-dimensional energy balance model.