The purpose of this study was to develop a computer program for pattern making of man`s Korean traditional trousers (Hanbok Baji). The IBM-PC/AT Computer was used in this study. The procedures of the study were as follows. 1. Basic pattern of Hanbok Baji was selected. 2. Co-ordinate points were instituted for indicate of relative location of all necessary points in drafting. 3. A program for drafting was developed. 4. The pattern of Baji for man`s Hanbok was automatically design by inputting individual body measurement (trouser length and hip girth). 5. Grading of standard size was accomplished by using same method.