Many operas and quyi have handkerchief programs. There are two kinds of Qin opera commonly used: four-corner pa and octagonal pa. Four-corner pa is mostly made of silk and yarn, which is soft, light and easy to use, and mainly combines various characters and different modality to perform. Octagonal handkerchief is a special handkerchief after processing, mostly double-layered, with octagonal sequins and an authoritarian circle in the middle, which is hard and heavy. About this kind of octagonal handkerchief, people are probably most familiar with the handkerchief that Errenzhuan flies around. Errenzhuan is called handkerchief, also called octagonal towel, but the handkerchief that Errenzhuan first used was square, and later it was changed to octagonal towel. According to legend, in the early 1950s, Liu Quan, an old artist of Errentai, learned the "handkerchief-throwing" of Errenzhuan, and found it difficult to master one silk as it floated. He put the two pieces together to form an octagon, which increased the speed and easily changed the pattern when throwing. He also created "throwing a handkerchief behind your back" (throwing a handkerchief behind your back). Most of the handkerchiefs used by them are red satin or red velveteen. First, cut off two pieces of seven-inch square flannel, crisscross the four corners into an octagon and sew them together. The corners should also be double-layered, and the corners can be decorated with gold thread, gold piece, etc. The octagonal pa in duet is very similar to the octagonal pa in our common duet, so it is difficult to determine which drama or folk art was invented first. (Press: Errentai is a kind of traditional opera in China, and Errentai belongs to Quyi).