Abstract: Well Block Zhao-30 lies to the east of Sulige gas field east,through core observation,casting thin sections identification,cathode luminescence observation and physical characteristic analysis as the research method,the petrology,pore types,pore permeability of Member 8 Formation have been studied,and then the paper discusses the reservoir characteristics and influencing factors.The results show that the rock types of the Sulige eastern region of Ordos Basin are mainly lithic quartz sandstone and lithic sandstone,and quartz sandstone is less.Its compositional maturity is very high,pore types are mainly secondary pores,rarely primary pore content,and surface pore was very low.The region develops braided river delta plain sand bodies,the distributary channel subfacies is in the majority,and mainly experienced the transformation of compaction,cementation and dissolution.This article is mainly from the source,the sedimentary facies and diagenesis into three aspects to discuss the influencing factors of the eastern area of Sulige.