Abstract: Approximately, over six thousand product lines of electronic circuit SMT(surface mount technology) had been built in our country at present. Although those product bundling lines are highly automatic, their productive effectiveness is not satisfactory, particularly in production sectors having many products type and variable batches. The potential of the equipment of those lines are not exerted completely. This situation limits the development of information technology and the improvement of SMT. Therefore, this article presents the method of building MES(manufacturing execution system) in the workshop of electronic circuit SMT. MES collect and analyze all sorts of productive data in the workshop, making the data visualized and controllable. Based on these data, operations of product line are optimized, and workshop materials can be managed in a dynamic way. In additional, this system can also be integrated with enterprise ERP, PDM and logistics systems to achieve data sharing and thus improve the effectiveness of SMT product line.