Abstract: In this paper，from the thermatic energy equation，water vapour conservative equation and the empirical relation between precipitation and water vapour as well as relative humidity, under the hypothesis that large scale circulation condition is not affected by earth surface change，the energy processes in atmosphere and earth surface is parameterized without considering the feedback effect of water vapour and temperature on radiative absorption,and a explicit relation between the change of temperature and rainfall in 'd region which is induced by the variation of albedo and Bowen ratio on the earth surface is finally established. For the North China plain with a linear scale about 550km，the results of a sensitive experiment indicate that if earth surface turned from current state to a desert，annual average temperature would increase 2. 14℃，and yearly rainfall would reduce 536. lmm，i. e. yearly rainfall would be 62. 5mm at that time. On the other hand，if the North China Plain were all covered with forests,the annual average temperature would almost not change ,and yearly rainfall would increase 21. 2mm.

Key words: earth surface, climatic change, the North China Plain