Cantilever Form Traveller is the main equipment in the cantilever construction, which can be divided into truss type, cable-stayed type, steel type and mixed type according to the structure. According to concrete cantilever construction process requirements and design drawings of Form Traveller,compare the various form of Form Traveller characteristics,weight, the type of steel , construction technology etc., Cradle design principles: light weight, simple structure,strong and stable ,easy assembly and dis-assembly forward , strong re-usability ,the force after deformation characteristics, and plenty of space under the Form Traveller , large construction jobs surface, conducive to steel formwork construction operations.