Liability for breach of contract, also known as civil liability for breach of contract, refers to the responsibility that the parties to the contract should bear for the debts in breach of contract. As an important measure to ensure the realization of creditor's rights and the performance of debts, the liability system for breach of contract is closely related to contract debts. On the one hand, the liability for breach of contract is the result of non-performance of debts, which is based on the existence of debts. On the other hand, the liability for breach of contract is a legal manifestation that the state forces the debtor to perform the debt and takes responsibility when the debtor fails to perform the debt. Therefore, the relationship between liability for breach of contract and contractual debt can be summarized as follows: debt is the premise of responsibility, and responsibility is the result of non-performance of debt.