Abstract: The OCAD optical design software package,which can carry out the national standards and military standards to draw optical system and various accessory (including prism) diagrams automatically according to the optical design data, is introduced. The optical diagrams drawn by OCAD are standard, practical and accurate, and can be used directly in production, which avoid the past hand-drawn work with the Auto CAD and other drawing benches. The OCAD can also use the data files of the other optical design software produced at home and abroad, and can form the data files for the other optical design software for calculation.