Abstract: With the requirements for noise in airworthiness certification increasing year by year, the prediction of component sound pressure level can provide a justification for aircraft flight test and a reference for the design of engine noise reduction. The component characteristics of the engine can be effectively determined by the prediction of component noise. In this paper, core engine noise is taken as a breakthrough, The static noise of the core engine is accurately predicted, and then the noise in the flight state of engine components is obtained by modifying the correlation mapping factor from static state to flight state, and finally to get the noise value of plane in the laternal condition. Furthermore, the noise values of other components can be predicted by this method, and then integrating these predictions are integrated to obtain the predicted noise of the whole engine, which can be used as a basis for airworthiness certification, to greatly reduce the cost of airworthiness approval process.