According to GB/T 3186-2006 "Paints, varnish and raw material sampling for Paints and varnish" (ISO15528:2000), this standard is proposed by the China Petroleum and Chemical Industry Association to specify the sampling method of Paints, varnish and their raw materials. The standard applies to liquids and materials that can be liquefied during heating but do not undergo chemical changes, and also includes powdered, granular and paste materials. The correct application of sampling methods is essential to ensure the mass and conformity of Coating products, especially during the quality control and product development stages. The implementation of this standard helps to reduce variability in the sampling process and ensure that representative samples are obtained for subsequent physical property testing and performance evaluation.