The purpose of the present invention is to provide an improved NTF method based on topography optimization. The method comprises utilizing a finite element method to establish a TB model and an acoustic cavity model, respectively loading three directions of excitation on each attachment point of a vehicle body and a chassis, calculating a model solution, and obtaining a corresponding curve betweenfrequency and acoustic pressure through a post-processing; selecting the frequency at the corresponding peak of the acoustic pressure curve which exceeds the target value, finding out the componentswhich contribute more to the panel under this frequency, and optimizing the topography; using the optimized structure, the NTF calculation being carried out again and more reasonable results being obtained. The technical proposal of the invention is that the NTF analysis is carried out on the original model of the vehicle, the unqualified items are found out, the topography of the related parts isoptimized, the optimized structure is replaced into the original model, other input conditions are kept unchanged, the NTF analysis calculation is carried out again, and the response curves before and after the optimization are compared.