Reasons why the power of attorney needs the signature of the client:

1. The 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.

2. However, if the agent fails to sign, the act of the agent 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 agent fails to produce it, the agent may terminate the entrustment at any time.

As the client, if you want to ensure the entrusted matters, you'd better sign the entrustment agreement and ask the client to sign the power of attorney, so as not to leave hidden disputes.

Conditions for the power of attorney to take effect:

1, the meaning of principal (principal) is true;

2. The agent has the ability to act as an agent;

3. The agent and the principal reach a consensus on the agency matters;

4. The entrusted matters do not violate the mandatory provisions of laws and regulations.

To sum up, if the power of attorney is in written form, the power of attorney shall specify the agent's name, agency matters, authority and time limit, and shall be signed or sealed by the principal. So the power of attorney needs the signature of the client.

Legal basis:

Article 490 of the Civil Code of People's Republic of China (PRC)

If the parties enter into a contract in the form of a contract, the contract shall be 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.

Chapter nine hundred and nineteen

An entrustment contract is a contract in which the principal and the trustee agree that the trustee will handle the principal's affairs.

Article 922

The agent shall handle the entrusted affairs according to the instructions of the principal. If it is necessary to change the client's instructions, it shall be approved by the client; If it is difficult to get in touch with the client due to an emergency, the agent shall properly handle the entrusted affairs, but shall report the situation to the client in time afterwards.