This paper studied the electron optics property of a high-power electron accelerator using the improved program based on SC program. Some optimieed results were given. The high-power electron accelerator has many applications in industry. For example, purification of flue gases of thermal power station from Sulphurous oxide and Nitrogen oxide; control and improvement of polyethylene insulation of cables and wires; cleaning of waste water; bactericidal process of grain; presulphuration of tires and study of composite material for soft roofing, etc.