In order to improve the modeling accuracy of automobile brake disc, three kinds of elements were used to establish the finite element model of brake disc. The first six order natural frequencies of the brake disc were obtained by calculation and test. It is found that the errors of the first six order natural frequencies between the finite element model established by using tetrahedral, 1-order and 2-order hexahedron elements are less than 9%, 2% and 7% respectively. Then, the mode shapes of the first order hexahedron finite element model were compared, and the constrained modal analysis was carried out. The results show that: the first six modes shapes of brake disc obtained by calculation and test are basically consistent, and the finite element model is accurate and reliable; the modeling accuracy of three different elements from high to low are 1-order hexahedron, 2-order hexahedron and tetrahedron respectively; three pairs of complex modes exist in the brake disc restraint boundary condition and attention should be paid to the design of brake system. The research method has certain reference significance to improve the accuracy of brake disc finite element.