Liuhua organic reef of Zhujiang Formation is located in the tertiary structure named Dongsha uplift which lies in Pearl River Mouth Basin．It is composed of rhodolite reef limestone，coralline framework reef,reef brecciola and bioclastic limestone．It can be divided into four types of intrafaeies and microfaeies，including reef core，reef base，reef fiat and reef front．It possesses the sedimentation model of platform edge moundy organic reef．The effectively accumulation spaces mainly are organic framework，primary intergranular pores，followed by different dissolved pores． The reservoir behavior is controlled by sedimentary microfaeies and diagenesis．The reef limestone of reef core microfacies is most favorable for the reservoir development，followed by bioclastic limestones of core base and reef flat microfacies．