合同解除是指合同有效成立后,基于双方当事人的合意或者法定或约定的条件发生时,依一方当事人的意思表示而使合同权利义务关系消灭的情形。合同解除是否具有溯及力及其法律后果,是合同法研究中的重点。合同解除有可能产生溯及既往的效力,也有可能不具有溯及力。合同解除的溯及力问题与合同解除的法律后果密切相关。 Contract lifted refers to the contract after the effective establishment of the parties based on the desired or statutory or agreed conditions, according to one party’s meaning and the contract rights and obligations disappear. It is the focus of contract law research whether the contract rescission has retroactivity and its legal consequences. The lifting of the contract may have retroactive effect, may not have retroactive force. The retrospective effect of contract termination is closely related to the legal consequences of contract termination.