The construction of roof slab of reserved opening of Metro station is common. The suspended formwork technology used in the construction of the largespan and largethickness castinsitu roof slab of reserved opening of Andelibeijie station is presented in terms of construction program selection, construction program design and calculation, construction procedure, safety, quality and difficulties. Conclusion is drawn that the suspended formwork technology is suitable for the construction of the largespan and largethickness castinsitu roof slab of reserved opening of Metro station.