Abstract: A numerical study for vibration based lattice truss structural damage identification was presented. Firstly, the validity of the numerical model was verified by comparing the calculated results with those of other researchers. Then, based on this model, vibration behaviors were simulated for delamination damages of different locations and different damage degree, and the relationship between delamination damage and natural frequencies and modal shapes was analyzed. The research results laid a foundation for the further study of the delamination damage inspection of lattice truss sandwich plate.