The four hus are divided into Mongolian four-hus, high-pitched four-hus, mid-voiced four-hus, low-pitched four-hus, Yi four-hus, and Buyi four-hus. They are mainly popular in Inner Mongolia, and are also found in other places such as Shanxi, Shaanxi, Hebei, Henan and Sichuan. Popularity.

Mongolian Sihu
Treble Sihu
Mongolian bow and stringed musical instruments. Also known as Mongolian Xiaosihu. It is restructured on the basis of the folk Xiaosihu. The sound is crisp and can be used for solo, instrumental ensemble. Popular in Inner Mongolia, Liaoning, Jilin, Heilongjiang and other provinces. The tone is crisp and melodious, beautiful and beautiful, and the volume is large. Playing skills The left-hand has portamento, vibrato, hitting, overtone, double-tone, double-tone, double-overtone, etc. The right-hand technique is similar to the erhu. Mainly used for solo, duet, and instrumental ensemble. Often with the alto sihu, matouqin, sanxian, yatuoka or huobusi and other instruments due to or ensemble.

Alto Sihu
Mongolian bow and stringed musical instruments. It is popular in the agricultural and semi-agricultural and semi-pastoral areas of Inner Mongolia, Liaoning, Jilin, Heilongjiang and other provinces. The shape is the same as the bass four-hu, slightly smaller. The piano barrel is cylindrical and made of thin brass plates, which is 16 cm long and 10 cm in diameter. The front of the barrel is covered with python skin or cowhide. , with a copper frame inside the mouth. The headstock is made of a single piece of mahogany or sandalwood, with a total length of 90 cm. The headstock is flat-topped, with four shafts on top, four silk or copper strings, and two ponytails tied with thin bamboo as a bow, with a bow length of 68 cm. The playing postures, methods and techniques are the same as those of the Bass Sihu. The alto sihu has two octaves, and the timbre is round and bright. It can be used for solo, duet, instrumental ensemble or to accompany rap music such as storytelling and singing. It is the main middle instrument in quartet and folk ensembles. It is often played in ensemble with the high-pitched four-hu, and with the high-pitched four-hu, matouqin, sanxian, and Huobusi.

Bass Sihu
Bass Sihu, Mongolian bow and stringed musical instrument. Also known as Big Sihu and Haolaibao Sihu, it is widely popular in pastoral areas and semi-agricultural and semi-pastoral areas in Inner Mongolia Autonomous Region. The bass sihu in the pastoral area can be assembled and disassembled into several parts in order to carry it on a horse, that is, a barrel, two bars, pegs and bows. The qin barrel was first hollowed out with a whole piece of wood to form a cylindrical shape. The barrel was 30 cm long and 15 cm to 20 cm in diameter. . Later, the qin barrel was made of hardwood into round, hexagonal or octagonal. The piano rod is made of wood, mostly in two pieces, with a total length of 110 cm, and four casing strings, silk strings or copper strings. The bow is made of wood or willow branches, and the two ends are tied with ponytails. The length of the bow is 85 cm. Mainly popular in Zhelimu League, Zhaowuda League and Xing'an League and other places. Mainly used for Mongolian rap Haolaibao and Mongolian singing.

Four hus of Yi nationality
The four hus of the Yi nationality are bow-drawn strings and musical instruments. Compared with the Han and Mongolian Sihus, the size is smaller and the sound is crisp and bright. Popular in Chuxiong, Yongren and other places in Chuxiong Yi Autonomous Prefecture, Yunnan Province.

Similar in shape to Jinghu, the qin barrel is cylindrical, mostly made of a bamboo tube with two transparent ends. The barrel is 11.5 cm long and 6 cm in diameter. The front of the barrel is covered with sheepskin or python skin, and the rear end of the barrel is covered open. The qin pole is made of bamboo, which is mostly made of phoenix-tailed bamboo in the local area, with a total length of 60 cm. The headstock is flat with no decoration, and the upper end is equidistant and horizontal with four axes. The pegs are made of wood, conical, 13 cm long, with straight petals engraved on the outside of the shank. There are silk strings in the middle of the piano bar, and a wooden or bamboo bridge-shaped bridge is placed in the center of the leather surface. Zhang four silk strings. The bow is made of golden bamboo, with a large camber, and two bundles of ponytails are tied at both ends as bow hairs. The length of the bow is 52 cm. Can be used solo or to accompany song and dance. The Yi people often entertain themselves by playing the Sihu solo. When the four-hu is used in singing situations, the performer dances while pulling it. It is a commonly used accompaniment instrument for folk songs and dances.

Buyi Sihu
The Bouyei Sihu is a bow and stringed musical instrument of the Bouyei and Miao people. The Miao people are also called Sixian Hu. Popular in Guizhou Province, Qiannan, Qianxi Nan Buyi and Miao Autonomous Prefecture.

The shape is the same as that of 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. The piano bar is made of hard miscellaneous wood, and the total length is only 35 cm. Some headstocks are carved into dragon heads, chicken heads or birds as decorations. 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.