The effect of anisotropic microstructure of semiconductor composites on the optical nonlinearity enhancement is investigated.The calculations are based on Stroud Hui expression for effective third order nonlinear susceptibility.The frequency dependences of effective nonlinear susceptibility for the anisotropic composites with semiconductor elliptic inclusions in an insulating host have been evaluated.The results indicate that the optical nonlinearity of bulk material may be enhanced by 1~2 orders of magni...