The current GB/T 9272-2007 used Archimedes principle to determine the dry-film density,combined with the sample liquid density and mass solid to obtain the non-volatile solid volume fraction,and then calculated the actual coating rate of corresponding dry-film thickness.It is not suitable for coatings with pigment/base volume concentration(PVC)above critical volume concentration(CPVC).Under the influence of Archimedes principle in the determination of dry-film density,the choice of Immersion liquid,the wettability of the dry-film in distilled water and the residual surfactant in the dry-film may cause obvious errors in the determination results.In this paper,the GB/T 9272-2007 comparison of Q/HFYQ 0001—2020 scraper method was used to preliminarily explore the deviation of the above influencing factors,and Q/HFYQ 0001-2020 scraper method completely avoided this problem.