Study of the Huns' management of the western regions 并列题名：Study of the Huns' management of the western regions Studies on the history of the western regions Study on the risk management of the western hydropower resettlement Study on the frontier defense of Tang dynasty in the western regions 并列题名：Study on the risk management of the western hydropower resettlement studies in the documents of the Western regions (1) Love songs of the western regions 20 Years'development of the western region 并列题名：20 Years'development of the western region