Abstract: Based on the core observation,according to cast thin,mercury injection and other information,the subdivision of Carbonate rock types and the studies of the its pore type,pore structure characteristics and influencing factors have been carried out.The study results indicate the study area is mainly of bioclastic limestone and oolitic limestone,with developed dissolved pores,uneven distribution of pore throats.Locally the pores are better reservoir segment,presenting honeycomb or tubular.In other parts,the lithology is dense,with small porosity and fine throat,being of poor connectivity.Therefore,lithology,sedimentary environment and diagenesis are the main factors affecting the pore structure.