合同解除制度是合同法的重要制度之一。合同解除的标的不仅包括合法有效的合同,还包括可撤销合同以及成立但未生效的合同。协议解除不应当纳入合同解除制度的范围。合同解除的条件分为约定解除条件和法定解除条件,约定解除条件可以排斥法定解除条件。合同解除条件的适用要遵循一定的原则。 Contract cancellation system is one of the important systems of contract law. The subject of the contract shall not only include the legally valid contract, but also include the contract that may be revoked and the contract that has been set up but not yet in force. Agreement to lift the contract should not be included in the scope of the lifting of the system. The conditions for the termination of the contract are divided into the conditions for canceling the contract and the statutory conditions for cancellation, and the conditions for canceling the contract may exclude the conditions for the statutory dissolution. The application of the conditions of contract termination should follow certain principles.