Abstract: In view of deficiencies of domestic heavy anti-corrosion overhaul materials in the structure and performance, a flexible heavy anti-corrosion material is developed independently through the research from the main polymer, tackifying resin, fillers choice, proportioning, molding process and other aspects, and a field test of mending repair application is carried out for the material at the outlet of initial station for a domestic pipeline. The results show that the material shows viscoelastic properties of the polymer, the viscoelastic body can restore its original thickness after external shocks and cold flow properties of the material can ensure tight connection with the steel pipe surface. Leak points and peel strength on steel and polyethylene (PE) of the material after the excavation test are in line with the technical requirements specified in BS EN 12068, ISO21809-3 and DIN30672. In addition, the material has the low requirements for steel pipe surface preparation and simple installation process. It can be widely used for joint coating repair of pipeline.