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The process of design and numerical calculation for rear wing is traditionally accomplished by manual interference, and the numerical results usually discuss the relation between aerodynamic forces and a single design parameter of rear wing. Computer program of wing profiles and two scripts were created in this paper such that the process of design analysis of a rear wing ranging from geometry generating and meshing to the numerical calculation can be fully automatically handled. This automatic design and analysis process was applied to the PACE 2008 global vehicle collaboration project, and as many as 4725 numerical cases due to the variations of five parameters were calculated using the computer program. Compared with original design, the process yielded a design with a six percent increase in downward force and a five percent decrease in drag.