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This paper introduces the method of MATLAB (Matrix Laboratory) and STK (Satellite Tool Kit) software interconnection. STK provides MATLAB the corresponding interface for further development. Using MATLAB and STK software to build simulation environment, the algorithm design and optimization of a constellation of Walker as an example, introduces the steps of the joint simulation process and the design method of GUI interface, and considering the influence of the satellite orbit, sensor, satellite formation and other related parameters on the optimal design of constellation. The results show that the combination of MATLAB and STK can be used to obtain the optimal results in the form of image and data list. The workload of MATLAB programming were greatly reduced by joint simulation. The corresponding track simulation and the data output can be completed when it comes to input parameters. It avoids the need to repeatedly adjust the STK parameters in the design of satellite constellation. In the analysis of the design of the satellite constellation, the MATLAB/STK joint simulation is more convenient and intuitive than a single software.