标的物的占有发生转移即为交付。买卖合同中的交付有四种类型,即现实交付、占有改定、简易交付、指示交付。交付是物权变动的一种方式,对于其性质的认定,应看作交付其实是一个事实行为。从我国合同法中可以看出立法者也倾向于这种观点。 Transfer of the possession of the subject matter is the delivery. There are four types of delivery in a sales contract, namely actual delivery, possession of a change, simple delivery, and instructional delivery. Delivery is a way of changing ownership, and the identification of its nature should be seen as a matter of fact. It can be seen from the contract law of our country that legislators also tend to take this view.