Abstract: Dibei gas pool is located in eastern Kuqa depression, its reservoir rock is tight sandstone of the Jurassic Ahe formation. This paper makes observation of the Jurassic outcrop section, description of the drilling core, and statistics of the casting thin?section analysis data,and then determines that the reservoir space is dominated by intergranular dissolution pores and a lot of fractures in this reservoir rock.Through description and statistics of the outcrop fractures, it suggests that the fracture?developed degree is controlled by the regional location, lithology, sand body thickness, and tectonic stress intensity, etc. The gas drive water experiment on the tight sandstone cores indicates that fractures can greatly improve the charging efficiency of gas accumulation, thus forming higher gas saturation in fracture?developed area, and controlling the natural gas enrichment of Dibei gas pool