Junda is a single-reed gas-sounding musical instrument of the Li nationality, which is full of strong local characteristics. The Han nationality calls it the double-pipe or Li nationality panpipes. It is popular in the area inhabited by the Li branch Li and Meifu Li in Dongfang City, Hainan Province and the ethnic bands of professional art groups in Hainan Province.

When playing ruida, there are two reeds in the mouth, and the fingers press the sound holes of the two pipes at the same time. The tone of the four-hole ruda is e1, and the tone of the one to four holes is: g1, a1, b1, c2, with a narrow range.

Junda's volume is louder and the tone is unrestrained, but it is softer and deeper than Lilie's. Often due to the slight difference in pitch of the two pipes, a unique sound effect is formed, which is quite rich in mountain flavor.