MSS for bridge erection is a kind of construction equipment with self-owned formwork and support of box girder to cast on site. It has the advantages of high quality construction, simple operation, and low cost. It has been widely used abroad for the construction of highway bridge, railway bridge which is more advanced. In China, it begins to be applied to the construction of highway and passenger-dedicated line. It can be used for the construction from the moving of the scaffold to the on-site casting.