According to different printing conditions and basic printing methods, it can be divided into sheet fed automatic flat offset press and web high-speed rotary offset press; According to different printing color number, it can be divided into monochrome machine, two-color machine, four-color machine, six color machine and eight color machine; According to different printing paper, it can be divided into four starting machines, double starting machines, full sheet machines and double full sheet machines. The difference with other rotary printing presses lies in the different types of printing plates. Rubber rollers and wetting devices are added.