Compared with three people making bowls with horseshoes, it is better for three people to make bowls. Covered bowl is a kind of tea set in Han Dynasty, which has a lid on it, a tray on the bottom and a bowl in the middle. Also known as "Sancai Bowl" and "Sancai Cup", the bowl covers the sky, holds the ground and serves people, which means harmony between heaven and earth. Three-talent bowl covering is a popular bowl covering device at present. Due to the progress of manual technology, the shape of bowl covering has been popular throughout the ages.