Abstract:It′s important to increase the capacity of Xichang so that the development and utilization of underground space can promote the overall development of the city and relieve its urban syndrome. By analyzing the current situation of under ̄ ground space development in Xichang cityꎬ this paper expounds the necessity of developing underground space from three aspectsꎻ and thenꎬ following the overall planning principleꎬ economic principle and system planning principle of urban un ̄ derground space planningꎬ it partitions the underground space in Xichang and makes underground space development plans according to regional characteristics. The above measures can improve the economic development of Xichang cityꎬ raise its transportation efficiencyꎬ and safeguard its rapid development. It provides scientificꎬ appropriate and practical suggestions for the future planning and development of urban underground space in Xichang as well as references for the development other medium-sized cities.