Legal analysis: The house purchase contract can be signed on behalf of others. A house buyer can entrust others to purchase and sell a house, and the rights and obligations arising from the agent and the counterparty to the contract will also bind the principal. However, the agent is required to have full civil capacity and relevant qualifications.

Legal basis: Article 143 of the "People's Republic of China and Civil Code" is valid for civil legal acts that meet the following conditions: (1) The actor has the corresponding capacity for civil conduct; (2) ) The intention is true; (3) It does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.

Article 161 A civil subject may perform civil legal acts through an agent. According to legal provisions, parties' agreement or the nature of the civil legal act, civil legal acts that should be carried out by the person himself shall not be represented by an agent.

Article 162: Civil legal acts performed by an agent in the name of the principal within the scope of agency authority shall be effective against the principal.