An interface element based on cohesive zone model is employed to simulate the interface in composite laminate. Decohesive element is established in terms of relative displacements and traction across the interface. In the present thesis, the finite element method is applied to study the process of laminte damage. The main content of this paper are summarized as below:1. Deduced the equation of the interface element on the base of principle of virtual work.2. The numeric simulations of the Double Cantilever ...