The roof is the connection between the building and the sky, an important shelter of the space, but also the core element of the building. The formal logic of the roof is influenced by two natural elements, gravity, and rain. Gravity is known as a permanent law of all things, however, rain is known as a natural thing that changes all the time. The resistance to gravity and the dredging of the rain determine the evolution of the roof. With the development of modern materials and mechanics, natural elements are no longer dominant in the form of roofs. The architecture shows an incomparably powerful human result, becoming more and more like a machine. The geometric purity of the form and the sense of the manual operation of the form (cutting, twisting …... ) demonstrate the ambition of modern people. Our philosophy of architecture is not like this. Architecture is not to drive away from nature, but to accept each other in the unity of man and nature: to guide the wildness of nature and to take good care of the vitality of nature.