When entrusting others to exercise their legitimate rights and interests on their behalf, the client shall show the legal documents of the client when exercising his power. The trustor shall not abandon the entrusted matters for any reason. If the client makes any rights and interests that violate national laws, the client has the right to terminate the entrustment agreement. Within the scope of the legitimate rights and interests of the principal's power of attorney, all the duties exercised by the principal shall be borne by the principal, and the principal shall not bear any legal responsibilities. In litigation, it refers to the certificate that the entrusted agent has obtained the qualification of litigation agent and conducted litigation for the client, which mainly includes the entrusted matters and the agency authority, and is signed or sealed by the client. However, in the process of other civil legal acts, there may also be authorized legal documents.