Abstract: With the continuous improvement of sensor technology and intelligent technology,intelligent proportional directional valve with built-in pressure sensor and temperature sensor are emerging. However,due to the large volume and slow response of the flow sensor,the flow sensor is difficult to be integrated into the proportional valve,so the flow information needs to be obtained indirectly by calculation. The traditional calculation method usually applies the empirical formula to the valve port flow coefficient. However,the proportional directional valve used in this study has a more complicated valve port shape and flow channel,which has a great influence on the valve port flow coefficient,and the traditional method is difficult to be directly applied. Therefore,the pressure sensors and the spool displacement sensor are used in this paper. The flow is calculated using the look-up table method and the flow feedback control is performed. This method can realize the flow dynamic control function of the proportional directional valve,thereby improving the versatility of the proportional directional valve.