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Nowadays, the finite element method (FEM) is used to predict the performance of vehicle compartment cavity, i.e. the acoustic modal, the acoustic frequency response, etc. The accuracy of conventional FEM for acoustic problem strongly depends on the size of the mesh, element quality, etc. As element size gets greater and distortion gets severer, the deviation of high wave number problem also gets larger. In order to improve the accuracy of acoustic problem, this paper introduces a novel cell-based smoothed radial point interpolation method (CS-RPIM) to solve the vehicle compartment cavity model. In present method, the cavity is discretized using tetrahedron background cells, the each cell is further divided into four smoothing cells and then the cell-based gradient smoothing operation is implemented through the smoothing cells.