Abstract: To analyze different completion parameters' influence on the productivity index of perforated liner completed horizontal wells quantitatively instead of using the common semi empirical way and make optimization design of these parameters,a coupled model of oil-gas-water three phase mixture fluids for perforated liner completed horizontal well which includes reservoir flow,well-wall inflow and well-bore flow was established based on the numerical stimulation technique.The influence of different completion parameters on the productivity index was analyzed through the research on Zhaoanping 5 well which is a perforated liner completed horizontal well,the parametric sensitivity of completion parameters was analyzed quantitatively with the method of gray correlation.The research shows that among those selected parameters,the descending order of their influence is:pollution degree,pore density,pore number per circle of liner,pore diameter,pollution radius,and screen out-diameter.These data shows good agreement with the production effect in the oilfield(the relative error of the fluid productivity index is 7.74%),indicating its accuracy.At the same time,the optimization design of this well's completion parameters was made and the calculation shows that its productivity will be raised by 18.18%.