Modelling coculation state between layers by means of a elastic layer, authers approach compliance and G 1 of delamination in ELS and ENF of composite. It is shown in present paper that the energy release rate remainslin finite value when the crack length vanishes and value of G1 is varable in large range for different values of leyer copulation state parameters. Therefore, the influence of copulation state between layers on G1 would be taken into consideration in measureme of G1. in ELS and ENF of composite