Abstract: The 2-section of Jialingjiang project belongs to strict and evaporated platform facies. Its main lithology is dolomite, gypsepus rock, limestone and a spot of pulpy rock. Arenite dolomite,politic dolomite, silty dolomite, silty-fine dolomite, politic lime-stone and arenite are of reservoir signification. The 2-section ofJiaLingjiang project has developed from seabed diagenesis，evaporated diagenesis, mixed water diagenesis, shallow-water,middle-water diagenesis environment and deep-water diagenesisenvironment. Early fresh-water leaching, near-surface(evaporating bump and refluent penetration)dolomitization, corrosion which is related to organic evolvement are the main member constructed diagenesis. The tectonic fracture has made its permea-
bility better. Besides, the compaction, pressolution，twice gypsum cementation are the 2-section of Jialingjiang project's main destructed diagenesis. The 2-section of Jialingjiang project has two types of studded carbonate rock and non-studded carbonate rock, which have 6 kind of lithology. This paper has created their diagenesis serial and the pore evolving mode.

Key words: diagenesis environment, pore evolution, section Ⅱof Jialingjiang Formation