Abstract: In order to address the issue of power supply for electrical valve in the deserts and other circumstances, a novel method of electrical valve power supply by accumulator is presented, which is charged by photovoltaic cell. The controlling circuits of digital software phase-locked loop (DSPLL) using digital signal process (DSP) is constructed, which is driven by the pulse-width modulation (PWM) controlled by DC motor. The experiments prove that the photovoltaic cell can provide enough energy to turn on or shut down the electrical valve. The control method not only realizes the functions of the whole system, but also runs more precisely and reliable. In addition, this method greatly decreases the harmonics and ripples of power supply systems, making the entire system realize online remote control, data acquisition and transmission, and display the torque of electrical machine on LCD precisely. At the same time, the DC motor is able to control the flow magnitude of electrical valve more precisely and steadily.