Legal analysis: When signing a house purchase contract, you can entrust others to sign it on your behalf, but you need to submit the following documents: first, the identity certificate of the principal and the trustee’s identity certificate; second, the authorization issued by the principal The power of attorney; thirdly, the power of attorney indicates the reason for the entrustment and the scope of authority of the entrustment.

Legal basis: "The People's Republic of China and the Civil Code"

Article 171: The actor does not have the power of agency, exceeds the power of agency, or after the power of agency is terminated, the actor still If an act of agency is performed without ratification by the principal, it will not be effective against the principal.

Article 311: If a person without the right to distribute real estate or movable property transfers it to a transferee, the owner has the right to recover the property. Unless otherwise provided by law, if the following circumstances are met, the transferee shall obtain The ownership of the real estate or movable property: (1) The transferee acted in good faith when transferring the real estate or movable property; 2) Transferred at a reasonable price; 3) The transferred real estate or movable property has been registered if it is required to be registered in accordance with the law; if registration is not required, it has been Delivered to the transferee.

If the transferee obtains the ownership of real estate or movable property in accordance with the provisions of the preceding paragraph, the original owner shall have the right to request damages from the person without the right to dispose of the property. If the parties acquire other property rights in good faith, the provisions of the preceding two paragraphs shall apply with reference.