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Aiming at the problems of harmonic reduction in power factor and distortion of current waveform in the power grid, an active power factor correction method which is most suitable for small power range is discussed in detail. According to the principle of correlation and Boost converter, a single-phase high power factor rectifier is designed. The results show that the harmonics produced by the corrected output current are obviously reduced, and the waveform of the output current is approximately being more sinusoidal. By adjusting the parameters of inductance and capacitance simultaneously, the current ripple is stable at 9.667%, the input voltage range of jitter is stable at around 6.8%.The power factor is greatly improved, the harmonic of input current is reduced effectively, and the electromagnetic interference is suppressed in the system, ensuring the goal for optimally normal working of the system. Therefore, restraining the harmonic of rectifier circuit and increasing the power factor is an effective method to improve the quality of power supply.