In Lunangui Mountain, where the Sani people of the Yi branch live, there is a story of the four strings of the Yi people.

A long time ago, there was a very beautiful girl Ama in Sani Village, she fell in love with the brave hunter Ava. They are all slaves of the headman, A Bao. A Bao wants to marry Ama as his wife, but Ama can't do anything. In order to force Ama to submit, A Bao sent someone to bring an ox cart of hemp flakes and ask her to twist it into silk thread.

From spring to winter, Ama rubbed her fingers, rubbed her palms, and rubbed the mountain wind sobbing along with her. Every night, when the moon penetrates into the thatched hut, Amma pours out her love to Ava in the distant mountains and sings silently.

In order to commemorate the pair of young Yi people who were in love with each other, people later twisted hemp silk into strings and tied them to the body to make four strings of the Yi people. It is also said that there lived an old father and his four daughters in Guishan. The industrious and intelligent father could learn to sing ninety-nine kinds of birds. He used ninety-nine days to make a four-string, which could play The most beautiful and beautiful music in the world.

Before the father died, he was worried that the four strings would not be played enough by future generations, so he threw it into the ditch. Since then, dense trees have grown in Guishan, and the best wood was cut by the Yi family to make the four strings with beautiful sound.