Graphene oxide (GO) and reduced graphene oxide (RGO) presents great potential applications in various fields due to their extraordinary properties. However, to synthesize GO and RGO environmental friendly and inexpensive still is a big challenge for large scale production. Although chemical synthesis method is the easiest, low cost, and large amount production compares to the other methods but there are some disadvantages using chemical such as toxicity, hazardous and corrosive which are harmful to the environment and human health. Therefore, it is recommended to using green reduction agent to replace the chemical agent. This paper presents a summary and discussion of the green reduction of GO to RGO using Oolong Tea extract. It also reviews the characterization of GO and RGO using of X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and ultraviolet-visible spectroscopy (UV-Vis). © 2018 Author(s).