Abstract: Taking the anchorage of rear seatbelt of vehicle as the object, based on the strength test result of seatbelt anchorage, a model was established by finite element method, the finite element model was simplified and debugged, and calibration analysis was carried out according to test results. After calibration, the finite element analysis results are basically consistent with the experimental results. Then, based on the finite element model after calibration, the structure was optimized to improve the strength of the anchorage of the seatbelt. The optimization scheme was verified by tests. Through the application of CAE analysis technology in the process of product development, the problem causes can be effectively found and optimized in a targeted way, thus shortening the development cycle and saving costs.