Legal basis: People's Republic of China (PRC) Civil Procedure Law.
Article 52 If one or both parties are two or more, and the litigation object is the same, or the litigation object is the same, and the people's court thinks that the trial can be combined with the consent of the parties, it is a joint lawsuit. * * * If one party to the same lawsuit has the same rights and obligations with respect to the subject matter of the lawsuit, the litigation behavior of one party is recognized by other * * * co-litigants, and becomes effective for other * * * co-litigants; If there are no * * * same rights and obligations on the subject matter of litigation, one of the litigants' actions will not be effective for other litigants with the same * * *.
Article 53 If a party has a large number of people, the parties may elect agents to conduct litigation. The litigation behavior of a representative is valid for the party he represents, but the representative must obtain the consent of the principal if he changes, gives up or acknowledges the litigation request of the other party and makes a settlement.