迟延履行情形下适用定金罚则有着严格的条件,即迟延履行必须导致合同目的不能实现。本文选编的一起房屋买卖合同纠纷中,一方当事人以另一方当事人办理房产证迟延为由请求双倍返还定金,但是由于迟延履行并未构导致合同目的无法实现,不应适用定金罚则。 The application of the deposit penalty in the case of delay in performance has the strict conditions that delay in performance must lead to the failure of the purpose of the contract. In a dispute over the contract of sale and purchase of houses selected by this article, one of the parties requested double the return of the deposit on the grounds of the other party’s delay in handling the real estate license, but the deposit penalty should not be applied because the delay in performance did not result in the failure to achieve the purpose of the contract.