Research conclusions:(1)After finishing the upgrading of the Guangxi coast railways，the self-management and self- operation model will be conformed to laws and regulations，and it will be conducive to the realization of the mutual benefit and win-win to the investment side，conducive to the reforms of investment and financing systems and conductive to realization of the diversification for railway construction.(2)If the commissioned transportation and management will be adopted，the Guangxi Yanhai Railway Company Limited will gradually lose its long-term business and it is not conducive to carrying out the trade and logistics business supported by the transportation and control of the costs.(3)From the angles of realizing unified scheduling, safety and high efficiency of the regional railway network，it is possible to consider to trust some business of the Gunagxi coast railways to the national railway enterprise，such as dispatching command and device management of the Guangxi coastal high-speed railway. ( 4 ) The research results can provide the reference and guidance to selection of operational management mode and the sustainable development of the newly built and reconstructive joint venture railways.