What is the competition system of the finals?

The competition system of the third season finals is as follows: first, the first round is the final order of drawing lots (this year, who won the seventh place by drawing lots, then he designated the sixth appearance, and then the sixth appointed the fifth appearance until the third appearance was confirmed, and the remaining two drew lots to decide who was the first 1 and the second appearance. In the first round, I sang with the singers in order. After that, those who voted last cannot enter the next round (because Sun Nan retired, the other six players entered the second round this time). The second round is pairwise PK, which is compared from beginning to end. Third and fourth, second and fifth, first and sixth. Vote for three champion candidates. Then, among the three singers, vote for the king of songs.