Abstract: The study on the diagenesis course of Cretaceous and Jurassic reservoir in the Luliang oil field indicates that evolution of reservoir pores is closely related to compaction,solution and cementation. Compaction,quartz secondary enlargement and kaolinite an aphase-infilling are main diageneses to damage pores. The solution of felspar and carbonate minerals are the chief diageneses to form sencondary pores. Space-time configuration of various diageneses controll the development of pores. Development of reservoir pores in vertical zoning formed a secondary pores belt. So,it is significant to forecast spatial distribution of the reservoir physical properties.