The roof of the National Stadium adopts the two-way tensioned grid structure, and its prestressed construction has certain difficulty. The prestressed construction scheme and some preparatory work in the early stage of construction are introduced, such as construction simulation calculation and the design of tensioning tools. This paper briefly introduces the prestressed construction monitoring scheme and the synchronous control measures in the tensioning process, and combines the results of simulation calculation and field monitoring, puts forward the prestressed construction technology and characteristics of this kind of structure.