Agency is a concept in civil law, which refers to a civil juristic act in which an agent expresses or receives his will to a third party (the counterpart) in the name of himself (the principal) within the scope of agency authority, and this will directly take effect on him. Agents are divided into legal agents and entrusted agents. In principal-agent, an agent can represent all legal acts within the scope of authorization, which belongs to general agent, also known as general agent or full agent. The difference between them lies in the difference of agency authority. Generally speaking, the authorization of lawyers in litigation procedures means that agents only have the litigation rights such as appearing in court, collecting and providing evidence, arguing, drafting legal documents and so on. Plenipotentiary means that the agent in the specially authorized agent can not only enjoy the litigation rights of general authorized agent, but also exercise the litigation rights involving the substantive interests of the parties, such as settlement and appeal. In addition, according to the provisions of relevant laws, in the course of the case, if the parties are not satisfied with the hired lawyer, they can unilaterally terminate the employment contract. If the lawyer is at fault, the law firm shall return all the lawyer service fees received in advance; The lawyer's service fee will not be refunded unless it is the fault of the lawyer. Legal basis: Article 59 of the Civil Procedure Law of the People's Republic of China entrusts others to represent the lawsuit, and 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 to 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 the Chinese people * * and Chinese citizens living abroad must be certified by the Chinese people * * and Chinese embassies and consulates in that country; If there is no embassy or consulate, it shall be certified by the embassy or consulate of a third country with diplomatic relations with the Chinese people, and then by the embassy or consulate of the Chinese people and the Chinese country in the third country, or by the local patriotic overseas Chinese group.