This paper presents a method which discretizes long and narrow belt-shaped structure into sequence of cross-sections and creates cross-section models automatically based on the real construction data. Then completion and schedule model of construction are obtained by connecting cross-section schedule models. This Method reduces data volumes effectively and improves automation degree and scalability of modeling constructions. The experiment has shown that this system is full-featured, the modeling and visualization of construction processes can meet the requirement of real-time.