Abstract: Base on the background and functions of suburban railway project, as well as the design experiences of suburban railway in China and foreign countries, and through analyzing the traffic accessibility, transfer convenience, feasibility of technical scheme and the flexible conversion of functions, the line through operation of the suburban railway and metro Line 2 in Zhengzhou City is recommended. Then, factors like the circuit functions, line conditions, average station space and energy consumption are analyzed, the maximum train speed of 100 km/h is recommended in order to perform the rapid contact channel functions, and implement the mixed operation with Line 2 that runs at the speed of 80 km/h. According to the analysis of passenger travel demands, travel time target, line conditions and system capacities, a differentiated service travel mode is provided to meet the commuter traffic and airport passenger diversification travel demands along the line, and the organization mode of express and slow train is recommended.