Abstract: The serves expressions of stresses and displace ments of both anisotropic and unidirectional fiber-reinforced com posite plates with cracks are derived.Each term of the series can satisfy the equilibrium equations,the equation of compatibility and boundary conditions of forces on the crack suifaces and other boundary conditions of forces can be satisfied by the variationat method to deter mine the stress intensity factors. Finally, the computational results about strip tension,compact tension and three point bending specimens are presented.