Legal analysis: if the house sold involves the joint property of husband and wife, in principle, both husband and wife need to sign and agree. If the house sold is the personal property of the husband and wife or the other party who sells the house meets the conditions of being good at obtaining it, even the unilateral signature is valid. Due to daily needs, either party has the right to decide whether the husband and wife have joint property. In addition to the needs of daily life, if one of the spouses makes an important decision on the joint property of the husband and wife, the husband and wife should negotiate on an equal footing and reach an agreement. Others have reason to believe that it was expressed by both husband and wife, and the other party shall not oppose a bona fide third party on the grounds of disagreement or ignorance.

Legal basis: Article 1065 of the Civil Code of People's Republic of China (PRC) stipulates that the property acquired during the marriage relationship and the property before marriage are owned by individuals, jointly owned or partly owned or partly jointly owned. The agreement shall be in writing. Where there is no agreement or the agreement is unclear, the provisions of Articles 1062nd and 1063rd of this Law shall apply. The agreement between husband and wife on the property acquired during the marriage relationship and the property before marriage is legally binding on both parties. The husband and wife agreed that the property acquired during the marriage relationship should be owned by each other, and if the other party knows the agreement, the personal property of the husband and wife should be used to pay off the debts owed by the husband and wife.