Abstract: A specified conformal transformation function and Laplace method are utilized jointly to establish a mathematical model of calculating a hydraulic fracturing well’s oil rate and accumulative oil at various producing time under the condition of infinite conductivity,Which may select fracturing wells and payzones so as to maximize economic profits.After that,the influence of effective permeability,net payzone thickness,fluid viscosity and the pressure difference of initial pore pressure to the bottom flowing pressure on the fracturing result is calculated according to the model put forward in the paper.Consequently,a comprehensive evaluation index which includes above four parameters is put forward on the base of above calculations,and the result indicates that the fracturing well’s oil rate is unchanged with the index kept as a constant while the included four parameters may be changed greatly,so that the index may quickly select the fracturing wells and payzones.Overall,The study may perform formation evaluation,fracturing effect evaluation and selecting the optimal fracture length.