Need. A power of attorney is an expression of the will of both parties. In principle, the signature of the trustee is required to show the approval of the entrustment, and it will take effect once it is signed. However, if the trustee fails to sign, the act of the trustee showing the power of attorney to the third party can also be regarded as the recognition of the entrustment, and the entrustment will take effect. If the trustee cannot produce it, the trustee may terminate the entrustment at any time. As a client, if you want to ensure the entrusted matters, you'd better sign an entrustment agreement and ask the client to sign a power of attorney to avoid leaving hidden disputes. Article 490 of the Civil Code If the parties conclude a contract in the form of a contract, the contract is established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.

Legal objectivity:

Article 165 of the Civil Code, if the power of attorney is in written form, the power of attorney shall specify the name of the agent, matters of agency, authority and time limit, and shall be signed or sealed by the client. Article 162 of the Civil Code: A civil juristic act carried out by an agent in the name of the principal within the scope of agency authority is effective for the principal.