In order to obtain an ideal aerodynamic performance in the aircraft aerodynamic shape design, it is necessary to go through multiple processes such as geometric modeling, model optimization, meshing, numerical simulation, and data acquisition and analysis, which are time-consuming, labor-intensive and error-prone. Therefore, this paper takes the DLR-F6 wing-body as an example, the numerical simulation process of aircraft outflow field was re-developed based on Star-CCM+ software, and the key codes of some functions were given. The program includes model import and geometric processing, meshing, physical model selection, boundary condition setting, monitoring point and monitoring surface setting, calculation parameter setting and calculation result viewing, etc. The results show that the method of Star-CCM+ re-development in this paper can make the numerical simulation of aircraft outflow field conduct in order and in regular, realize one-key setting, improve the efficiency of the numerical simulation of aircraft outflow field, ensure the accuracy of calculation and the consistency of the iterative calculation the results, and avoid the omission or mistakes in the simulation process.