Based on the fractal theory,the paper analysis the spatial structure of tourism subsystem(such as tourism scenic spot system,tourism city system,tourism transport system) in Lhasa, finding the tourism scenic spot system distribution is too concentrated and centricity is strong; the tourism city system structure is compact and highly concentrated; the tourism transport system is a centrifugal type; Three subsystems coupling is better,but the significant contradiction still exist between the concentration of tourism scenic spot and city system and the centrifugal of transportation system. By the study, the authors put forward some specific suggestions about accelerating development of tourism cites and characteristic towns to promote the tourism service function,giving priority to develop the surrounding scenic spots to promote the balanced development of regional tourism and Strengthening the construction of the road connected to scenic spot to improve the density of road network.