The concrete arch bridge has the advantages of high rigidity, strong spanning ability and small deformation of daily temperature difference. It is the kind of bridge type that can meet the requirements of high-speed rail. When the span of the arch bridge exceeds 200 meters, the stiff skeleton concrete arch bridge is the preferred structure for economic and safety reasons. In the past ten years, in the mountainous high-speed railway line, China has built six mountainous stiff concrete arch bridges with a span of 300 meters. The high-speed rail has a strong demand for extra-large span concrete arch bridges. However, the successful pouring of large-volume outsourcing concrete onto the stiff skeleton is still a difficult problem in construction. Based on the investigation of a large number of such bridge types, this paper summarizes several methods of loading and unloading concrete when pouring concrete, and enumerates the actual bridge examples to illustrate its load-carrying effect, and obtains the advantages and disadvantages of different methods of loading and the scope of use. And the outsourcing concrete pouring for long-span steel tube concrete skeleton arch bridge.is prospected.