If the house purchase contract is not signed and sealed by the fingerprint, the contract is valid, and the signature and seal have the same legal effect as the fingerprint. A contract is an agreement that defines the rights and obligations of both parties. It will take effect when the signatures and seals of both parties are completed or the conditions agreed by both parties are met. Article 502 of the Civil Code of People's Republic of China (PRC) * * * A contract established in accordance with the law shall take effect upon its establishment, except as otherwise provided by law or agreed by the parties. In accordance with the provisions of laws and administrative regulations, if the contract should go through the approval procedures, such provisions shall prevail. If the failure to go through the formalities such as approval affects the effectiveness of the contract, it will not affect the performance of the obligation clauses such as approval and the effectiveness of relevant clauses in the contract. If the party that should go through the formalities for approval fails to perform its obligations, the other party may require it to bear the responsibility for violating its obligations. The modification, assignment and dissolution of a contract shall be subject to the provisions of laws and administrative regulations, and the provisions of the preceding paragraph shall apply and shall be subject to approval.