Abstract: Impact problem is a common problem in engineering, and it is also an important part of mechanics of material. In general teaching process of mechanics of material teaching, only vertical impact and horizontal impact problems are taught. However, oblique impact problems are not involved. In this paper, the dynamic load coefficient is derived by energy method for oblique impact problem. The results show that for the dynamic load coefficient of oblique impact, the horizontal impact problem of horizontal bar is the maximum, and the horizontal impact problem of vertical beam is the minimum. The obtained oblique impact dynamic load coefficient can be degenerated to horizontal and vertical impact. It is verified by finite element numerical simulation, and the relative difference between numerical solution and theoretical solution is not more than 1.5%. This result helps to understand the impact problem in depth, which is of great significance for materials mechanics teaching and analysis of engineering application problems.