In this paper, computer aided design(CAD) technology is applied to general V-belt transmission. A number of tables and diagrams for V-belt transmission design are programmed. Furthermore, according to the maximum load-bearing capacity of V-belt, optimum technique is introduced to determine the V-belt type, standerd length, numbers and center distance of belt pulley, etc. The design parameters are inputted in man-machine conversational mode, and the operational instructions are shown on screen in Chinese. The program can be carried on an IBM-PC or 486 or 586 micro-computer. Case study shows that the technique is applicable to engineering design and computer aided instruction (CAI) for courses of machine design, Fundamentals of Machine Design and CAD in Mechanical and Optimum Design, etc.