Straight flute, also known as gap flute. Miao fringe air music instrument. In Miao language, it is called exhibition pole, which means straight blowpipe. Also known as Zhanqingjiao in Hmong language, it means a notched blowpipe. Popular in Xingyi and Anlong in Guizhou Province, Longlin, Xilin, Napo in Guangxi Zhuang Autonomous Region and Guangnan and Funing in Yunnan Province.

When Miao young men and women are socializing, jumping slopes or in love life, most of them are men playing the flute and women singing harmony. Although there is no fixed tune, the soft and euphemistic tune blown out is like singing an emotional love song.

On occasions such as traditional Miao festivals, weddings and funerals, or entertainment commemorations, the straight flute is often played in ensemble with folk instruments such as Lusheng, Konoha, Saixiao, and Miao Sanxian, or accompanied by folk songs and dances. When two straight flutes are played in unison, those with the same or an octave difference are often used, commonly known as male and female flutes, which can complement each other or add flowers.

Traditional repertoires include "Minor", "Major", "Lifang", "Inviting Guests" and "Thanks".