Qing Tuan is generally made of glutinous rice flour, glutinous rice flour and boiled rice flour. The viscosity of glutinous rice flour is very good, so putting glutinous rice flour into green balls is mainly to enhance the viscosity of green balls. Glutinous rice flour can enhance the hardness of green balls, and adding glutinous rice flour can improve the hardness of green balls. Qingming grass green ball is also made of a plant juice called Qingming grass. In Sichuan, it is made of glutinous rice flour mixed to make green ball. Because Sichuanese like to make grass cakes with Qingming grass during their stay in Tomb-Sweeping Day, it's also delicious to make Qingming grass green balls with Qingming grass.