Abstract-Layout design of the production line is a difficult problem directly affecting the productivity. This paper researches on a rapid method of dynamic layout for the production line in manufacturing industry. Based on virtual simulation technology, a visualization system of production line layout is developed using virtual simulation software called Unreal Engine. The developed layout design system is applied for a steel production line. Moreover, the production process simulation function of layout design system is used to simulate the production process of this production line. The reasonableness of production line layout is verified so that it can be modified and optimized easily.