The invention discloses a communication system networking method and a network architecture, and relates to the technical field of mobile communication application, and the method comprises the steps:constructing a first GCSE communication system based on a GCSE architecture; constructing a second GCSE communication system based on the GCSE architecture; and performing cross connection on each network element of the first GCSE communication system and each network element of the second GCSE communication system according to a network element sequence of a GCSE architecture, and forming a GCSEreliable communication system taking the first GCSE communication system as a main GCSE communication system and the second GCSE communication system as a standby GCSE communication system.