Abstract: The Toutunhe formation of Middle Jurassic is the main sequence for oil exploration in Fudong (eastern Fukang) slope zone in eastern Junggar basin. By means of many analyses and testing methods, this paper studies the characteristics of lithology, reservoir space and physical property of the second member of Toutunhe formation in the Fudong slope zone, including the reservoir controlling factor analysis in detail. The results show that the lithology in this member is dominated by fine arenstritic sandstone, the reservoir space is dominantby primary intergranular pores, belonging to medium?porosity and medium?low?permeability reservoir. The reservoir physical property is controlled by the provenance and abnormal pressure zone, the reservoir distribution is controlled by the sedimentary facies and paleo?geomorphology, and the reservoir quality is controlled by the clay minerals types and contents in this area