悬赏广告古已有之,在现实生活中也正成为一种日益普通的现象,且被广泛的运用。然而,悬赏广告长期置于债法合同之下,似有一定道理,但究其性质,与合同之性质又有许多不同之处。本文认为将悬赏广告的性质作为一种附生效条件的单方法律行为即单方允诺更为合理。 Reward advertising has existed for a long time and is becoming an increasingly common phenomenon in real life and is widely used. However, there seems to be some truth to the fact that rewarded advertisements are placed under the debt-obligation contract for a long time. However, there are many differences between the nature of the contract and the nature of the contract. This paper argues that it is more reasonable to regard the nature of the reward advertising as a unilateral legal act that is a condition of validity.