Abstract: In view of problems such as unsatisfactory accuracy and efficiency in the traditional design of the satellite cable network, a tridimensional expert design system for satellite layout and cable design is proposed based on the secondary development of the Pro/E software. The software structure and the model building as well as the layout design and the cable design are also discussed. The system has been applied in the satellite development. The result indicates that the system can effectively realize the collaborative design of the traditional satellite tridimensional layout and cable, and the tridimensional design of the satellite cable.