For the non-uniformity of wide field line CCD image,a uniform method based on image pixel gray value compensation is introduced.The radiation luminosity of line CCD is calculated,which is developed by the micro-area of different coordinate in the line object.Then the relation between pixel values of the center place and the other place is induced.In order to accomplish the uniform of large field line CCD image,the model of gray value compensation is built.A plenty of pavement images captured by large field line CCD are processed by the proposed method.The results show that the method is of great flexibility,robustness and applicability.