Abstract: A fluid-structure coupling model including the gearbox housing, internal air and the lubrication oil was built by the finite element method to predict the radiation noise of gearbox more accurately and acquire the actual operating state of the gearbox. The finite element model of housing was verified through a modal test. Based on the acoustic boundary element theory, the radiation noise level of the gearbox was simulated under the excitations of the engine and the gear meshing forces. Furthermore, the simulation results were also validated by an acoustic test. The results can provide a beneficial support for the further study of gearbox noise control.