Legal analysis: required. 1. A house purchase contract generally requires the buyer’s signature and confirmation. This is the right of the parties concerned. 2. If the house purchaser is indeed unable to sign due to special circumstances, he may entrust another adult citizen in writing to act as his agent to sign and seal. 3. As long as there is a written authorization from the home buyer, the agent’s signature is legally binding.

Legal basis: Article 490 of the "People's Republic of China and Civil Code" Where the parties conclude a contract in the form of a contract, the contract is established when both parties sign, seal or fingerprint. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it. Laws and administrative regulations stipulate or the parties agree that a contract should be concluded in written form. If the parties do not use written form but one party has performed its main obligations and the other party accepts it, the contract is established.