Sister Xiao, Buyi and Miao people play musical instruments. The Bouyei language is called Uli Ulu. In Miao language, it is called Zhandaxi, Libu, and Mimi. Chinese called sister Xiao.

The sisters' flute pipes are made of bamboo and are tied side by side with two six-hole flute pipes with the same length, thickness and pitch. It is mostly made of locally produced water bamboo, and the specifications are different.

The length of the tube is 25 cm to 40 cm, the inner diameter of the upper end is 1.3 cm to 1.5 cm, and the tube openings at the upper and lower ends are transparent. The flute pipe adopts an inner plug-type air inlet, that is, a wooden plug is placed at the upper end of the pipe, and a groove with a width of 0.2 cm and a depth of 0.2 cm is cut out on one side of the wooden plug to form an air inlet channel with the pipe wall. At a distance of 3 cm from the upper end orifice, a sounding hole is opened facing the air inlet channel, and the hole is 1 cm long and 0.3 cm wide. The pronunciation holes are mostly located on the back of the tube body. There are six circular sound holes in the lower part of the front of the tube body, and the hole spacing is the same. The distance from the pronunciation hole to the sixth hole is equal to the distance from the sixth hole to the first hole.

Among the Buyi people, there are also eight-hole (the first seven and the last one) sisters' flute; among the Miao people, there are seven-hole (the first six and the last one) sisters' flute. There are also sister flutes that use bamboo reed pronunciation in a few areas. In the collection of the China Musical Instrument Museum of the Institute of Music of the China Academy of Arts in Beijing, there is a pair of the Bouyei sisters' flute. The tube body is made of water and bamboo, with a total length of 41 cm and six holes on the top. It is a folk product in 1958. It has been included in the large-scale picture book of "Chinese Musical Instruments Illustrated Guide".