In the sulfur trioxide process of washing enterprises, the production cost of computer control is slightly higher than that of instrument process control, but the function of computer control far exceeds that of instrument process control. The use of computer control can make full use of international advanced technology and scientific management methods, simplify the complexity of manual operation, reduce the impact of manual operation proficiency on product quality, give full play to the potential of equipment, improve enterprise efficiency and competitiveness with the same industry.