The porosity detection methods of metallic coatings are comprehensively reviewed in the DIN EN ISO 10308-2006 Porosity test review standard. The porosity of metallic coatings is an important factor affecting the coating mass and performance, such as corrosion resistance, mechanical strength and long-term stability. The standard reviews existing methods for determining porosity, assessing their application range, applicability and advantages and disadvantages of each method. By comparing different detection technologies, it provides suggestions for improving detection methods and improving test accuracy, helping relevant field personnel to optimize the quality control of metallic coatings and improve product reliability.