Dizi (pinyin: dí zi), also known as the horizontal flute, is generally used as an important musical instrument to accompany opera.

The traditional flute, made of bamboo, has six sound holes, and there are also ten-hole flutes, one blow hole and one membrane hole.

The sound of the flute is crisp, high-pitched, transparent and round. Solo and ensemble are both distinctive and expressive. The sound of the flute depends not only on whether the shape and position of the blowing hole are properly excavated, and whether the thickness of the pipe wall is appropriate. The aging and the size of the membrane holes have no small influence on the tone.

The vocal range of the bamboo flute is limited to three groups, and today it is generally only possible to play two and a half groups. The widening of the sound range of the flute is an all-round thing, which includes the shape and size of the blow hole, the proper position and fingering combination of each sound hole, the strength of the mouth, and the proper position of the membrane hole. Generally speaking, the size of the membrane hole is moderate, and the position is slightly close to the end of the blow hole, the sound range is wide, otherwise the sound range is narrow.