Abstract: Traditional coatings have many defects in the application of pipeline internal corrosion protection and the problem of inner joint wrap has not been solved till now. Liquid solvent-free coating is a kind of special coating material for inner corrosion protection with high property and high solid content, with which the defects of traditional coatings can be overcome and that of inner joint wrap can be solved. The article introduces key technologies, study process and result of the coating, and the superiority and prospect of its application for inner corrosion protection in oil and gas field pipelines.