Hehuanxiao is a unique musical instrument of the Zhuang people. Although Hehuan Xiao is called Xiao, it is very unique. Although there is a blow hole at the end, there is no sound hole on the body. It is popular in the rural areas of southern Guangxi, such as Yongning County on the bank of the Yongjiang River in Guangxi Zhuang Autonomous Region.

The structure of the acacia flute is extremely simple. The tube body is a bamboo tube with sections at both ends. It is made of a locally grown bamboo called "single bamboo". When making, generally choose a bamboo tube with a length of about 60 cm and an outer diameter of 1.5 cm to 2 cm, but both ends have bamboo joints, and the tube body must be straight. In the center of the section at the two ends, a long through hole is opened in parallel, and along the two through holes, the bamboo tube is broken into two evenly divided halves, and then the two ends are closed as they are. Fastened with a rubber band, an acacia flute was made.

The tube body of this kind of flute is not divided into the beginning and the end, because the elongated through holes opened at both ends are the same, either end can be used as a blow hole, and the other end is a sound hole. There is neither a sound hole nor a reed whistle on the body of the pipe, and only two broken marks remain. Even so, people still fix one end as the head of the pipe, which is used as a blow hole, and tie the other end with floating ears as a decoration.