The GB/T 8923.1-2011 standard provides a visual evaluation method for the surface cleanliness of uncoated steel and steel after the original coating has been completely removed. The standard is proposed by the China Shipbuilding Industry Group Company and is under the supervision of the relevant technical committees. The standard defines the rust grade and treatment grade of the steel surface, which provides a specific evaluation basis for the surface preparation before coating. Through visual inspection of the steel surface, the degree of rust and treatment mass are evaluated to ensure the adhesion and durability after Coating application. This standard is applicable to the standardized management of steel surface preparation to ensure the quality control of Coating construction.