The present invention provides a group air ticket transaction method and system based on a computer system. The system group ticket transaction system comprises a management server and a client. The management server comprises a database and communicates with a civil aviation ticketing server. The management server is connected to an Air China payment platform, a mobile payment platform, and a settlement system. The client visits the management server through a web application. The management server comprises a group building module which exchanges data with the database, a group examination module, a fare group application module, a judgment module, a deposit payment module, an information improvement module, a fare payment module, a ticket issuing module. According to the system provided by the invention, the group air ticket bargaining management process is simplified, the booking of group air tickets by a travel agent or an individual team is facilitated, the working efficiency of an air company is improved, the time of ticket buying is saved, the ticket buying efficiency is improved, the working pressure of route members is reduced, and the practicability is high.