Presently the T₁j²₂ stratum have become the important stratum of oil and gas exploration in Dachiganjing structural belt of east Sichuan, through  comprehensive researches of reservoir sedimentary feature、 reservoir physical property、reservoir influential factor and reservoir prediction, we find that the  T₁j²₂ reservoir pore spaces were dominated by crystal-to-crystal pores and corrosion pores, and the reservoir type was defined as fracture-pore  type. The reservoirs were classified in four types, and in this area reservoirs mainly belong to type Ⅲ，however, in the stratum profile, type Ⅰand type Ⅱ were few distributed, and formed 1～2 high porosity section. The reservoir physical property were primarily dominated by sedimentary facies、corrosion and  dolomization. Through reservoir prediction, it indicated that the reservoir in Mainan structure and Mopan-Laowan buried structure which located in short limb and  bottom wall were finely developed ,this two areas were the primary area for the further exploration and drill site design in Dachiganjing structural belt.