Through the painting maintenance and construction of Yanjiadai overpass renovation and upgrading project,the painting quality and construction technology of waterborne coatings in outdoor concrete structures and steel pipe handrails are studied.This paper analyzes and improves the problems of water absorption,water absorption degradation and engineering application of waterborne industrial anti-corrosion coatings.Since the operation of the waterborne coatings maintenance and painting project for 3 years,the waterborne coatings system has been well protected,setting up an engineering demonstration for the promotion and application of industrial anti-corrosion waterborne coatings.