Abstract: This paper took complex fault- block reservoir in AreaⅡ of Gangdong oilfield of Dagang as an example,established the structural model of the research area by applying the method of key single sand layers controlling and fault classification time step simulation based on the knowledge of seism,drilling and geology.The contradiction of structural product data among different fault- blocks has been solved and the hierarchical data of sand members in well points has been made reasonable.Finally,the reliable analysis for the structural model has been conducted,many technical problems such as thin single sand layers,well- developed faults,and variable stratigraphic production have been solved.A reliable guideline for sedimentary microfacies simulation,physical parameters simulation and the potential tapping of residual oil with reservoir numerical simulation is available.