The entrustment and agency of civil juristic acts can be in written form or oral form. If the law requires it to be in writing, it shall be in writing. The written power of attorney for entrusted agency shall specify the name, agency matters, authority and time limit of the agent, and shall be signed or sealed by the principal. If the power of attorney is unclear, the client shall bear civil liability to the third party, and the agent shall bear joint liability.
legal ground
Article 65 The parties shall provide evidence of their claims in a timely manner. The people's court shall, according to the litigant's claim and the trial of the case, determine the evidence that the litigant should provide and its time limit. If it is really difficult for the parties to provide evidence within the time limit, they may apply to the people's court for an extension of the time limit, and the people's court shall extend the time limit appropriately according to the application of the parties. If a party fails to provide evidence within the time limit, the people's court shall order it to explain the reasons; If the people's court refuses to explain the reasons or the reasons cannot be established, it may reject the evidence according to different circumstances, or accept the evidence but admonish it and impose a fine.