Distribution of sand body in CⅢ Formation Tazhong 40 well block is complicated and reservoir heterogeneity is strong. Taking deterministic modeling and stochastic modeling method into consideration, the structural model, sedimentary microfacies model and attribute model controlled by microfacies of CⅢ Formation Tazhong 40 well block were established by Petrel software in which the sedimentary microfacies model was established under four restrained mechanisms, then the recalculation of the geological reserves was also completed on the basis of the models. Research shows that the microfacies which can store the oil was dominated by highenergy foreshore sandsheet, the porosity and permeability of the third layer were better than that of the first and second layer in research area obviously. What's more, the value of geological reserves calculated by threedimensional geological model was objective and reasonable, which layed the foundation for further development and adjustment of CⅢ Formation Tazhong 40 well block. In general, it owned reference significance for the application of faciescontrolled modeling insimilar area.