At present, in the bidding process of steel structure enterprises, the communication among the marketing personnel, the designers and the owners is not convenient, which greatly reduces effect of external publicity of steel structure enterprises. Based on BIM, the paper develops a marketing system for steel structure manufacturer companies, which includes the steel design system and the web display platform. The two platforms use the JSON to transform data with each other through the Internet. The marketing system enhances the connection among the marketing personnels, the designers and the owners, and is able to display the models to owners more intuitively than ever, which increases the communication efficiency and improves the propaganda effect.