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In order to reduce the oscillation frequency of the medium frequency noise in the engine room and obtain more accurate wave analysis results, a FE-SEA hybrid method was proposed to predict the medium frequency noise in the engine room. According to the acquisition status of the principle parameters, the node attribute structure in the engine room subsystem was divided, and the fe-sea mixed modeling process was completed. On this basis, all common nodes in the frequency band are screened, a standard noise cavity system is established according to the sealing principle of intermediate frequency holes, and then all pre-connected structures are combined to realize the pretreatment of intermediate frequency noise in the engine room. In this paper, the control conditions of fe-sea hybrid method for noise prediction are analyzed from four aspects of frequency band accuracy, subsystem stability, noise loss factor and transmission path, respectively, so as to realize the smooth application of if noise prediction method in engine room. The results of practical analysis show that compared with SEA method, fe-sea hybrid prediction technology can stabilize the oscillation frequency of medium frequency noise in the engine room at about 100hz, which plays a proper role in promoting the accurate analysis of frequency band waves.