Abstract: With the economic development of metropolitan area, commuter express has gradually become one of the important modes of constructing metropolitan rail transit. In order to further optimize the operation management of metropolitan rail transit, to allocate resources scientifically and save commuting time, it is necessary to study the through train operation among different train control systems. By analyzing the current status of rail transit integrated development in China and abroad, and comparing the technical differences in system architecture, function logic and information flow of domestic trunk railway CTCS and urban rail transit CBTC train control systems, a multi-network integrated train control system suitable for commuter express is proposed considering multi-network integrated train control system design requirements.