Legal analysis: First, it can be handled through consultation, which can be understood as invalidating the previous second-hand housing contract and signing a new contract after consultation. If the buyers and sellers of second-hand houses can't solve the contract disputes of second-hand houses through consultation, they can only bring a lawsuit to the court and ask the court to handle the disputes of second-hand houses.

Legal basis: Article 119 of the Civil Procedure Law of People's Republic of China (PRC) must meet the following conditions: (1) The plaintiff is a citizen, legal person and other organization that has a direct interest in the case; (2) Having a clear defendant; (3) Having specific requests, facts and reasons; (4) It falls within the scope of civil litigation accepted by the people's court and is under the jurisdiction of the sued people's court.