Abstract:There are two types of roof structures in Turpan's traditional dwellings, namely the flat roof type and the vaulted roof type. The sequence,time and origin of these two structures in this area have always been a mystery in history. Based on the evolution law of architectural structure and form,and with the archaeological excavation of Yanghai cemetery and Jiaohe city, it is concluded that the flat-topped dwellings with dense beams were earlier than the vaulted dwellings in this area. Based on the archaeological excavation of the relics in this area and the related historical facts such as the spread of Buddhism, this paper puts forward that the application history of the vault in Xinjiang is later than that in the Han Region from the perspective of technical demand, and points out that the application of the vault in this area has experienced two stages of religionization and secularization.