The rational development of suburban railway and the provision of bus-based rail transit services for commuter traffic are effective ways to meet the travel needs between the central city and the new city（or group）. On the basis of in-depth study of the current situations of suburban railway development at home and abroad，researches are studied on the existing line resources of Beijing railway hub，and the current situation of regional railway network is screened. Through the investigation of the existing three suburban railways in Beijing（S2 line，sub-central line and Huaimi line）and demand analysis，the line positioning and planning proposals of each line are put forward. The construction of large and small branch lines are proposed to achieve the connection between the surrounding groups and the attraction of passenger flow points along the lines，and solve the problem of the capital functional dispersal and the inconsistency trend of existing railways with the development of cities. Finally the construction of “two vertical and two horizontal，stems and branches combination，group interconnection，four networks integration” of the suburban railway innovation path network planning and its phased implementation plan are put forward. So that in the network structure，urban common line，suburban branch line，four network integration，and the quick access among the main groups in the metropolitan area can be achieved ultimately.