Based on the CCD image technology,this paper proposes a new kind of image contour aiming system which has realized image contour aiming of general optical instrument and modern digital instrument and resolved the problems of low automation degree,aiming accuracy affected by operator heavyly,intensive labour and not easy to be computerized etc.The construction and principle of the new system are presented and the data processing method of the image contour is analized emphatically in this paper. The experimental research has been done at last.