The volumetric solid content of liquid coatings was calculated based on thedry-wet film thickness ratio，which was the easiest and fastest method to measure the volumetric solid content of liquid coatings. This article described the conventional wet filmpreparation and the problems existing in the determination of dry film，also provided the HOLFliquid solid coatings volume testing scraper structure and application method，and the dry andwet film thickness ratios was measured with a mathematical model to calculate the volume of a liquid coatings solid fraction. Compared to the test method specified in standard GB/T 9727— 2007（ISO3233：1998）， the error by using this method for determination of volume solidcontent of a liquid coatings was less than±1%，which provided significant practical value for research and production，management of finishing，and finishing cost control.