An interactive graphics system for drawing logic circuit diagrams is developed, and its configuration, features, and operations are described in this thesis. The system is constructed with a microcomputer system, equipped with a digitizer and a graphic terminal as the major I/O devices. Some larger system may be needed in order to incorporate many powerful features of a Design Automation system, and approaches in DA systems are described. The system showed good results for small digital systems on a stand-alone basis, and possible enhancements of the system for the design of the larger digital systems are proposed.