Abstract: Different hot-formed door impact beams were designed based on a Geely door impact beam, to complete the lightweight scheme of 1800 MPa hot-formed door impact beam. On the production mold of 1500 MPa door impact beam,different schemes of door impact beam were manufactured with the same thermal forming process parameters, and the bending performance of parts was obtained by simulation and actual test of static and dynamic three-point bending test. The feasibility of the lightweight scheme was further verified by the simulation analysis of the side impact of the vehicle. The results show that the thinned scheme with 1800 MPa hot-formed steel can achieve 14.3% lightweight, and it is concluded that the performance of the thinned scheme is equivalent to that of the basic scheme, which can meet the lightweight requirements of the vehicle.