GB/T 9966.4-2020 "Natural Stone Test Methods, Part 4: Abrasion Resistance Test" standard specifies the test method of natural Stone abrasion resistance, including the equipment used, sample preparation, test procedure and report of results. The standard is suitable for testing the wear resistance performance of natural Stone and provides two test methods: the grinding disc abrasion method (Method A), which is suitable for raw materials such as blocks and square pavement stones; and the grinding wheel method (Method B), which is suitable for product testing, such as composite panels and marble slabs after surface preparation. The standard provides a technical basis for evaluating the abrasion resistance of Stone in different use environments.