Abstract: By using mineralogy,sedimentology,reservoir geology and multidisciplinary theory,combined with core,slice,physical property analysis,test analysis and other kinds of data,the reservoir petrology characteristics,reservoir space types,reservoir pore structure characteristics,the reservoir physical properties of Fei3 member in the south of Kaijiang-Liangping trough have been studied in this paper.It has been believed that the reservoir of Fei3 member is oolite beach and the lithologies are oolitic limestone and oolitic dolomite.Most of reservoir rocks show the characteristics that permeability is low and porosity of oolitic dolomite is relatively higher.The main controlling factors of the reservoir development have been analyzed and the analysis indicates the dolomitization and dissolution fracture are important factors that can affect reservoir development.