The mechanism of asphalt photooxidation under ultraviolet radiation was discussed,and the dominant factors those influence asphalt photooxidation speed were analyzed.The wave range of intensive ultraviolet radiation in Qingzang plateau was investigated.The intensive ultraviolet radiation aging testing apparatus was used to compare asphalt material aging between indoor and outdoor environment.Ultraviolet radiation emulation system of asphalt aging is established in this paper,which is of value to provide a reliable analytical method of the asphalt photooxidation aging in the northwest region of China.