实际履行本来是实体法概念,内涵中并不必然包括诉讼、国家强制力等内容,其本质应是债务人依约履行。实际履行既是债的理论中债权请求履行力、诉请履行力以及诉请执行力的体现,在合同法理论框架下又是违约救济措施的一种,因此具有双重属性。构成要件不同于证明要件,“债务不履行”应成为实际履行的构成要件之一。 The actual fulfillment is originally the concept of substantive law, the connotation does not necessarily include litigation, state coercion and other content, its essence should be the debtor according to the contract. The actual performance is not only the performance of debt claims, the performance of appeals and the execution of litigation in the theory of debt, but also a kind of default remedy under the theoretical framework of contract law, so it has dual attributes. Constituent requirements are different from the proof requirements, “debt non-performance ” should become one of the elements of the actual performance.