As the most widely used building material in the field of current construction, reinforced concrete is very important to the study of its own performance, especially to the numerical analysis of the nonlinear relationship between various materials. The nonlinear analysis of reinforced concrete composite floor slab by using finite element analysis software is of great significance to practical engineering application. In this paper, the development status of composite slabs and the analysis of their performance by finite element method are introduced, and the expectation of enlarging the application of nonlinear finite element method in engineering is put forward.