Erhu, also known as "Huqin", appeared in the Tang Dynasty, and was called "Qinqin" and "Qinqin" in the Song Dynasty. It is generally believed that today's Huqin is developed from Xiqin, and now it has become a unique stringed instrument in China. It is not only suitable for expressing deep and sad content, but also suitable for describing magnificent artistic conception.

Erhu is made of wood, with one end wrapped in python skin and two metal strings. The inner chord and the outer chord are separated by a pure five-degree angle. Generally, the inner string is d 1 and the outer string is a 1. Its playing techniques are very rich, including kneading (intonation), overtone, vibrato, glide, plucking and so on. The right hand has connected bow, divided bow, bow, jumping bow, trembling bow, flying bow and plucking bow. Erhu usually has the tuning of d 1 and a 1, and its effective range is three to four octaves.