MSR is a kind of GEO welding system which satisfies the requirement of multi-vehicle production. Its modular design provides an ability of conveniently installation and maintenance. It fulfills the needs of at least four types of vehicle’s co-production, while it also fulfills the extra needs by reserving place for switching fixture offline. The automatic switch of fixture can be finished in a short period of time, which can shorten the time-loss caused by the fixtures switching and greatly improve the automation and flexibility level of the production line