Aizhai Bridge is a steel-girder stiffening single-span suspension bridge, and adopts the rail-cable sliding frame beam method for beam construction. The rail-cable sliding frame beam method can quickly realize the erection of the main beam of the suspension bridge, and has good safety, economy, high quality and high efficiency, and the application prospect is very broad. This paper briefly describes the structure of the rail-cable sliding frame beam system, and focuses on the installation of the lifting saddle of the key components in the rail-cable sliding frame beam method Design, manufacture and inspection.