Abstract: It is illustrated that pass ive buildings about the energy-saving by three aspects: the glacis strategy of plane layout, the effect of different exterior areas with different forms, and the ways of how to deal with the structure of outer enclosure, in which water-loop heat pump air-conditioning system is taken as the key point. From the illustration above, it is also expounded the passive buildings' advantage and feas ibility, and affirmed their contribution to human sustainable development.