Mr. Yu is a single-reed gas-sounding instrument of the Jingpo and De'ang peoples. In Jingpo language, "筚" is a general term for air-sounding musical instruments, and "general" means double, which means a pair of air-sounding musical instruments with parallel pipes. Folks have the same style but different specifications. Regarding its origin, there is an ancient story circulating in Jingpo Mountain Village, Zhanxi Township, Yingjiang County.

A long time ago, the mountain officials of the Jingpo people and the chieftains of the Dai people fought a war for land. At that time, two brothers were forced to take part in this battle, and the elder brother died in this place in Zhanxi. The younger brother came to the place where the elder brother died in the battle. He was very sad. He found two bamboo pipes and a gourd, made a musical instrument, and played it to express his longing for his elder brother. The sad tune made people listen to it. Sour tears flowed out. Because this musical instrument was made in the place of Zhanxi, everyone named it Zhanxi.