The front fulcrum cable hanging basket is widely used in long-span PC（prestressed concrete）cable-stayed Bridges, but it is difficult to assemble and put in place under the condition of limited space in mountainous areass, and the problem of mutual interference with cable towers, main beams and stay cables is prominent. In order to solve the related problems of mysterious valley bridge of Lancang River, research on the structure design and installation method of hanging basket through the methods of structure adaptive optimization and finite element simulation analysis.The results show that the special-shaped hanging basket construction combined with hanging basket and 1 # section cast-in-site girder assembled shared stents scheme venues adaptable, guarantee the construction quality, safety, schedule, prestressed concrete cable-stayed bridge construction in the mountains of wide popularization value.