Traditional analysis of the leaf spring applied only a simplified mechanical model without considering the friction between the leaf springs. In order to do better in designing the leaf spring with variable cross sections, this paper firstly constructed a parameterized model of the taper leaf spring, and then applied the contact theory to add contact element to simulate the friction between the leaf springs in the FE analysis. After these steps, the assembly of the prestressed, the stiffness, and the damping ratio could be achieved. It shows that the analysis of the performance of taper leaf spring based on FE contact analysis can reflect the actual situation more comprehensively after comparing the results with those calculated in traditional ways and those recommended by industry.