Abstract: This paper, based on the fact that it is hard to develop a real-time and efficient expert system on the conventional computer, proposes a scheme of an opto-electric hybrid computer for expert system (OEHCES) which can be realized easily. The OEHCES is consisted of three parts: main control machine, knowledge storehouse and the optical marcher, and uses a modified knowledge representation and the optical marcher to partially solution of the problem whose matching speed is too slow in the conventional computer.