In this paper, a method is provide to determine the tolerances of the components based on computation of digital model and data fitting, tolerances chain analysis on the aerodynamics edges, combining with equalized tool design and process control of model based design (MBD) model. Varity of digital methods, such as laser tracker and data fitting between MBD model and the product, is adopt to equalize the tolerances during assembling. The structural interference can be avoided with this technique, making the product meet the demand of the delivery specifications. Besides, it decreases the rates of tolerance exceeding and the cost of manufacturing. The accumulated tolerance of aerodynamics can be reduced to 10% of designed demands during assembling with the method.