legal ground
Article 59 of the Civil Procedure Law: A power of attorney signed or sealed by the client must be submitted to the people's court when entrusting others to represent the litigation. 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. The power of attorney sent or entrusted by China * * and China citizens living abroad must be authenticated by China * * and China's embassy or consulate in that country; If there is no embassy or consulate, it shall be certified by the embassy or consulate of a third country that has diplomatic relations with the people of China, and then by the people of China and the embassy or consulate of China in a third country, or by the local patriotic overseas Chinese delegation.