Research purposes：According to the functional orientation of the Beijing—Shenyang High—speed Railway in the railway network and the network plan for passenger outgoing and incoming of the Shanhai Passage，this paper systematically studies the timing of building the Beijing——Shenyang High——speed Railway through the comprehensive analysis and prediction of total passenger transportation volume of outgoing and incoming of the Shanhai Pass，the reasonable functions of various railways，the annual adaptability and transportation efficiency of existing railways and the demands of regional economic and social development．Construction of high—speed railway takes long time with the larger amount of investment，and it has the big influence on the local economic and social developments，SO the decision—making process is very complicated．The adaptability analysis of the corridor and passenger traffic volume related to the railway network is the most basic data for the decision—making on the timing of building the railway，but it is not the only determining factor．In addition，the regional economic development，improvement of comprehensive efficiency of railway network and environment change caused by the construction also should be fully taken into account．The research methods and ideas on the timing of building the railway presented in this paper can be as the reference to the similar works．
Research conclusions：conclusions：(1)From the views of meeting the traffic demands of outgoing and incoming of the Shanhai Pass and optimizing the railway network structure，the railway construction should be complete by 2020 in order to relax the traffic pressure and improve the service quality of the passenger outgoing and incoming of the Shanhai Pass．(2)From the views of promoting the coordinated development of the regional economy and improving the construction environment，the railway construction can change the poor transport situations of Chengde，Chaoyang and Fuxin areas along the railway，develop and enrich the travel resources and maintain the closely economic exchange of Beijing and Shenyang with the surrounding areas，and it is crucial to promotion of the coordinated development of the regional economy．(3)From the view of the projectg economic benefits，the two rapid passenger corridors with large traffic capacity will be formed after building the railway and they can enhance the railway network flexibility because they have enough traffic capacity in the early days after railway building．The trains of the different grades can run to meet the demands of the different passengers to reflect the public welfare and basic features of the railway．(4)The research on the method for the timing of building the railway presented in this paper is available for planing and construction of the transportation infrastructure．
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