According to the characteristics of Liangqing Bridge and the situation of construction site, the main cable erection traction system is improved, and a new single-line three-stage reciprocating traction system is put forward. The application of this system greatly improves the main cable erection efficiency, shortens the construction period and guarantees the construction quality. This method provides a reference for the construction of the main cable of the long-span suspension bridge in China, and has important popularization value.