Selection method of ceramic tile: 1. Ceramic tiles are divided into five grades, first-class, second-class, third-class and off-grade. Because of the big price difference, it needs to be compared carefully. 2, look at the size of the specification, which is not only conducive to construction, but also reflects the decorative effect. Good specification deviation is small, uniform after paving, straight brick joints and good decorative effect. Products with dimensional error greater than 0.5 mm and flatness greater than 0. 1 mm will not increase the construction difficulty, and the effect after decoration will be poor. 3. Hardness tiles are top-grade with good hardness, strong toughness, and no brittleness or decay. Scrape each other with the edges and corners of tile fragments to see whether the broken fragments are fine or loose, brittle or soft, leaving scratches or loose powder. If the former is top grade, the latter is poor quality. 4. Ceramic tiles with good patterns have clear and consistent patterns and colors, exquisite craftsmanship, and no obvious color leakage, dislocation, broken lines and inconsistent shades.