In view of previous studies,the flowing process of G/L Jet Pump follows the rules of Mass Conservation,Momentum Conservation,Energy Conservation and Gas Equation of State,then the method of calculating outlet pressure has beengotandit has been applied to nodal analysisto obtain a feasible model of choosing well and optimizing parameters,but it has not been tested on site.Thus,setting up the technical process of onsite verification,the paper has verified the early method through two overseas wells developed by Jet gas lift.The outcomes show,the relative error of built model is relative low and that of added pressure of pump is 19.0%.This has proved calculating model is feasible and can be applied in the real well.Keeping the other parameters unchanged,the paper makes sensitivity analysis for designing parameters and working parameters of Jet pump based on one of the first well,and evaluates the sensitivity,which has guiding significance for spreading and applying the Jet gas lift in overseas.