Buyi Sihu (pinyin: bù yī sì hú) is a bow-drawn stringed musical instrument of the Buyi and Miao nationalities. The Miao people are also called Sixian Hu. Popular in Guizhou Province, Qiannan, Qianxi Nan Buyi and Miao Autonomous Prefecture.

It is the same as the Yi Sihu, but the body is smaller. The qin barrel is cylindrical, hollowed out with bamboo or paulownia wood, and the specifications are different, depending on the player (ie the maker). The front mouth is covered with python skin or sheepskin, and the back is open. There is a gallbladder inside the piano barrel, which is coiled with a steel wire, which can make the instrument emit a beautiful tone and a long reverberation.

When playing, the left hand holds the qin and presses the strings, and the right hand holds the thin bamboo-tethered double-haired bow to play. The bow hairs are sandwiched between the first and second strings and the third and fourth strings respectively. Only use the first position, do not switch to play. The sound is soft and loud. Can be used for solo or accompaniment. Buyi and Miao people often play to entertain themselves during festivals and slack, and they are also the accompaniment instruments for folk songs and Buyi opera.