Fuyu oil layer is the main oil and gas-bearing series of strata in Yumin area. By the studies of the relative data on the core observation, thin section of casting, and the others, the studied area has experienced the following diageneses: mechanical compaction, cementation, metasomatism, dissolution, etc. On the basis of the studies of these diageneses, the many impacting factors of the secondary pores are comprehensively considered, and the stacked and grading method of the main controlling factors are adopted to horizontally predict the development of the secondary pores in Fuyu oil layer of Yumin area.