Article 59 of the Civil Procedure Law, if a person entrusts another person to represent him in litigation, a power of attorney signed or sealed by the client must be submitted to the people's court.
The power of attorney must specify the entrusted matters and authority. An agent ad litem must have the special authorization of the client, and can admit, waive or change the claim, make a settlement, file a counterclaim or appeal on his behalf.