The contract performance system is at the core of the entire contract legal system. Compared with the civil codes of other countries, China's Civil Code has different characteristics in its legislative arrangements for contract performance rules: “Performance” refers to “contract” rather than “debt relationship”, which is based on the development process of contract relationship. “Performance” and “non-performance” are included as a form of liability for breach of contract as liability for breach of contract. The Civil Code contract is compiled on the basis of the Contract Law to optimize the statutory supplementary rules for the “performance of the contract”, link up the right of uneasy defense and anticipated breach of contract, improve the situation change system and other substantive amendments and several formal amendments. At the same time, the “green” principle, debt performance rules, and “relationship with others” specifications have been added; the reservation of the rules regarding the implementation of government-guided prices and government pricing, the formation of Precarious Right to defense, and debtor performance difficulties due to creditors' reasons are worthy of recognition, but the “impact of changes in the parties to the performance of the contract” should be deleted. The shortcomings of the Civil Code contract performance rules include unreasonable contract performance principles, incomplete debt performance rules, and inappropriate norms for “relationships involving others”.