The series fire pump adopts one-stage centrifugal pump whose body is made up if high-strength aluminum alloy and while priming pump is water-ring type vacuum pump. The series pump has a light weight and compact conformation. Main pump automatically starts the priming pump after it operates and when pressure exists in main pump, priming pump separates itself. The fire pump has a high vacuum degree of 88 Kpa and a short-term priming time. It runs stably and dependably. It's widely applied in various fire vehicles and other refitted vehicles, and aslo fixed fire pump group.