Take the Taiping Lake Bridge as an example,based on the life-cycle cost management concept,the scientific and reliable anti-corrosion coating maintenance and repair design of the steel structure of the Taiping Lake Bridge will be ensured to ensure the social,economic and environmental benefits of the project,and the cleanliness level and bottom of the key technology substrate paint,topcoat and construction tooling are compared and tested.The water jet blasting process,artificial and power tools are preferably used to polish the cleanliness level of St3.The epoxy zinc-rich primer and polysiloxane topcoat are selected to clarify the construction process key points of operation control for project quality,safety,and environmental protection,engineering application has achieved positive results.