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Aerodynamic characteristics of an Ejection Seat System at different angles of attack are studied by the numerical method and the flow mechanisms for such flows are carefully analyzed.The goveming equations are Reynolds-averaged Navier-Stokes equations which are solved by the unstructured finite volume method.Upwind Osher scheme are used for spatial discretisation and five-stage Runge-Kutta scheme is applied for temporal discretisation.The DES model based on S-A one equation turbulence model is adopted.Parallel computation is based on the domain decomposition method and multi-block is achieved by using METIS system.The Message Passing Interface (MPI) library routines are utilized.