In the reservoir water temperature conducted annual test, test data shows that water temperature perennial remain in 9 ~ 10 in certain depth below. Reservoirs and lakes are huge natural cold source. In an air conditioning engineering, the reservoir cold water was directly used as cooling source. The air conditioning effect is good and to gets good energy-saving and environmental benefits. It suggests that solar energy, natural ventilation and natural cold and heat storage in water should be widely used in the western tourist architecture in order to achieve low carbon tourism.