Abstract：

According to the characteristics of weather and buildings in Foshan area, through computer simulation, analyses the effects of the thermal parameters of envelopes and window-wall ratio on air conditioning cooling load. Considers that reducing the window-wall ratio and enforcing the performance of exterior window should be taken as the keystones to energy conservation of buildings in Foshan, and the key to enforcing  the performance of exterior window is to improve the shading coefficient. The building orientation should be  facing the south/north. The envelope cooling load of public buildings with a window-wall ratio of 0.5, designed according to the energy efficient standard, can be reduced by 50% compared with that constructed with ordinary envelope materials.