This paper presents a calculation method of collapse displacement of automotive steering column and an experimental optimization method considering interval uncertainty. Firstly, a dummy impact test bench was built to collect acceleration and displacement data. Secondly, the calculation method of column collapse displacement was proposed by proportional coefficient method. Finally, a response surface model was built based on the displacement calculation method. Each test variable was analyzed, and the robustness of the test method was optimized by combining the interval uncertainty model. The results show that the displacement error of the proportional coefficient method is reduced by 17.9% compared with the traditional method. Compared with the traditional test method, the interval radius of displacement error corresponding to the test method considering the interval uncertainty is reduced by 14.6%.