The use of frequency conversion technology for asynchronous motor speed regulation has been widely used in motor speed regulation, on the other hand, multimedia information interaction equipment,PLC industrial control and sensor technology, communication technology in the hydraulic system has been widely used, this topic on this basis, for AC frequency conversion speed regulation applied to hydraulic flow control in the working principle, characteristics of analysis and exploration, some conclusions The theory shows that frequency conversion speed regulation technology has broad application prospects in hydraulic system.