For oil control valves, the testing platform was designed. The platform included a constant pressure oil supply system which pressure was kept by loading weights. In the platform, a program controlled PWM source was used to excite oil control valve to realize a continuously variable supply current from 005 A to 105 A. The parameters of oil control valve, including current, flow rate and supply oil pressure, were dynamically inspected and recorded. With a data acquisition and a LabVIEW language program, the platform could automatically export currentflow curve, currentpressure curve and any features based on these curves.