A new refueling control mode was proposed——Variable frequency refueling. The flow rate of fuel was measured with a transducer and then the signal was used to control a variable frequency driver, thereby the speed of pumping was varied. The desired flow rate and pressure head for the application were not only achieved by this method, but also rather large error caused by the electromagnetic valve was reduced. As compared to other refueling modes, this mode can obviously improve the refueling accuracy.