Before Han Dynasty, flute usually refers to clarinet. Since the Qin and Han dynasties, the flute has become as famous as the clarinet and the flute, and it has been enduring for a long time. During the period of Emperor Wu of the Han Dynasty, Zhang Qian introduced the flute, also known as "transverse blowing". There is a clarinet, and a piece of wood is added to the blowing head, so that air can pass through the gap and shoot at the boundary tombs of the two whistle holes for pronunciation. There are many kinds of flutes in Song Dynasty, including fork flute, dragon neck flute, eleven-hole small transverse flute, nine-hole big transverse flute and seven-hole rain flute. After the Yuan Dynasty, flutes were similar. Due to the vigorous development of traditional Chinese opera, dizi has become an accompaniment instrument for many kinds of traditional Chinese operas, and it can be divided into two categories: Bangdi and Qu Di. In 1960s, Zhao Songting invented Paidi, which tied two or four flutes with different tones together, and the range could be expanded by more than three octaves. The music is colorful and easy to play. The flute is a widely circulated playing instrument in China. Because it is made of natural bamboo, it is also called bamboo flute. The flute is made of a bamboo tube with the inside cut off, and the tube body has a blowing hole, a membrane hole and six sound holes. The blowing hole is the first hole of the flute, and the air is blown in from this hole, which makes the air in the pipe vibrate and sound. The membrane hole is the second hole of the flute, which is specially used for sticking the membrane of the flute. Flute membranes are mostly made of reed membranes or bamboo membranes. When the flute membrane is vibrated by airflow, it will emit crisp and mellow music. Although the flute is short and simple, it has a history of 7000 years. About 4500 years ago, the flute was changed from bone to bamboo. At the end of 1 BC, during the period of Emperor Wu of the Han Dynasty, the flute was called transverse blowing, which played a very important role in drum music at that time. Since the 7th century, the flute has been improved, and membrane holes have been added, so that its expressive force has been greatly developed, and its playing technology has also developed to a high level. /kloc-in the 20th century, with the rise of Yuan Qu in Song Ci, the flute became the main instrument to accompany lyrics and sing songs, and it was also an indispensable instrument in folk operas and ethnic opera bands.