Abstract: In order to solve the problem of heavy workload and difficulty in disassembly and assembly of the carriage, taking the double-skyline freight ropeway used for hoisting the steel structure of Xiamen Health Trail Project as an example, the structure and principle of the carriage were analyzed, the structure of the closed traction mechanism of the carriage was optimized according to the actual working conditions, and a kind of fast disassembly device of the carriage was designed by using the quick disassembly bolt of the tube clamp. At the same time, the carriage was optimized in the size, structure type and material distribution according to the force and deformation of the carriage and the results of SolidWorks finite element analysis, which could solve the problems of the overall weight,unreasonable structure, material redundancy and short life of the carriage. The results of calculation and analysis showed that the disassembly and assembly of quick detachable grips device was small, and it can reduce the labor intensity of the workers. The optimization scheme reduced the material and the overall weight of the carriage by 9. 32%. Meanwhile, the stress concentration was transferred from the body to the rib plate under the condition of ensuring the safe operation of the carriage, which improved the overall life of the carriage and provided ideas for the optimization of similar carriage.