Three kinds of typical wood plastic composites were taken as the object and their bending performance was studied through experiment. Finite element models of structures were established. Finite element analyses were carried out through applying specific load and constraint conditions of experiment. The result showed that using the simulation index to evaluate the basic structure performance is high precision and feasible, which can simplify the structural design of sectional bar. The purpose was to provide reference for structural design of sectional bar of wood plastic composites.