Legal analysis: If someone else is entrusted to buy and sell the house, the client should issue a power of attorney, and then apply to the public security organ with the trustee for notarization and submit the power of attorney and other materials.

legal basis: article 165 of the civil code of the people's Republic of China

if the power of attorney is in written form, the power of attorney shall specify the name of the agent, the agency matters, the authority and the time limit, and shall be signed or sealed by the principal.

Notarization Law of the People's Republic of China

Article 25 A natural person, legal person or other organization may apply for notarization to a notary office at its domicile, habitual residence, place of behavior or place where the fact occurred.

an application for notarization involving real estate shall be submitted to the notary office where the real estate is located; The provisions of the preceding paragraph may apply to the notarization of entrustment, declaration, gift and will involving real estate.

article 27 the parties applying for notarization shall truthfully explain the relevant information of the matters applying for notarization to the notarization institution and provide authentic, legal and sufficient certification materials; If the supporting materials provided are not sufficient, the notary office may request to supplement them.

after accepting the notarization application, the notarization institution shall inform the parties of the legal significance and possible legal consequences of the notarization application, and keep the contents of the notification on file.