Light-emitting-diode (LED) lighting has been widely used in various fields due to the rise of green energy industry. Thus, the LED driver devices play an important role. This paper will reference to an LED drive circuit which is an integration of AC-DC rectifier and single-end primary inductor converter (SEPIC) DC-to-DC converter. This circuit is with the function of active power factor correction. Finally, the paper will be for the harmonic analysis, power factor, and power conversion efficiency indicators to verify its superiority.