Drawing pneumatic circuits by hand and searching for the error when the circuit is not properly constructed are very difficult. In this paper, a graphic simulation program for drawing and evaluating pneumatic circuit systems was developed. The porgram is menu-driven style and pneumatic circuit can be easily drawn by selecting the pneumatic components from the menus. Simulation of the motion of each pneumatic component and testing of whether the circuit is constructed properly are possible with the software. This program was written in Turbo Pascal and also used the Turbo Graphix Toolbox. The system hardware requires IBM PC, XT, AT or compatibles, and Hercules Card.