Abstract: The bracket vehicle is an important brace facility in the acoustic test of spacecraft, and it is important to study how to use this facility for the spacecraft vibro-acoustic predication. Based on the hybrid FE-SEA method, different cases and vibro-acoustic models are established for spacecraft, and the effect of the bracket vehicle on the vibro-acoustic response of spacecraft is analyzed. The simulation results show that the bracket vehicle mainly affects the responses of low-order modes of the system, and its effect on the high-order modes could be neglected. This conclusion can be a guidance for the simplification of a complex spacecraft vibro-acoustic model.