The traditional national mode commonly used in China is five-tone mode, that is, five tones: Gong = 1, quotient =2, angle =3, sign =5, feather =6, (no 4 7). These five tones can all be used as tonic, and a mode is established around them: the one with the tonic "1" is. The tone with "2" as the main tone is the quotient mode; The tone with "3" as the main tone is angular mode; The tone with "5" as the main tone is key signature type; Feathering mode with "6" as the main tone.
All you have to do is look at which of the five notes a China tune ends with, and that note is the tonic. The mode of this piece of music is named after this.