设权性乃法律行为的本质属性之一,法律行为欲为设权,且也能为设权。从历史分析、概念探源、价值定位及个性区别四个方面可知法律行为本质上是以权利为本位的设权行为。法律行为通过意思表示的成立与生效而使法律关系发生变动,产生私法上的效果。深刻认识法律行为的设权属性具有重要的理论意义。 Settling is one of the essential attributes of legal act. The legal act is to set up the right and can also set up the right. From the aspects of historical analysis, concept exploration, value orientation and individual differences, we can see that legal acts are essentially rights-based rights-based behaviors. Legal acts change the legal relationship through the establishment and entry into force of the expression of intention, resulting in the effect of private law. It is of important theoretical significance to deeply understand the empiricism of legal acts.