人身危险性理论的诞生，引起了刑法理论的重大变革。如今，我国刑法学界已普遍接受了人身危险性这一基本概念，但是对于人身危险性的内涵、功能定位等还没有形成统一的认识，制约了我国刑法对于人身危险性在立法和司法实践中的运用及完善。笔者认为刑法学上的人身危险性是狭义的，特指犯罪人的再犯可能性，侧重从刑罚学的角度，为量刑提供指导。人身危险性对刑罚裁量具有重要意义，犯罪行为的社会危害性和犯罪人的人身危险性共同决定了犯罪人的刑事责任的大小，人身危险性在社会危害性的基础上影响着刑罚的轻重，体现了报应和预防价值的统一。现行立法中存在大量体现着人身危险性内容的刑罚裁量制度中，司法实践中也经常运用人身危险性来影响量刑。重视发挥人身危险性在刑罚裁量中的独特价值，是一种必然的选择。但是，也要看到人身危险性的准确测量是非常困难的，并且根据罪刑法定、罪责刑相适应原则以及受我国现有制度支撑条件和司法人员综合素养等方面的制约，对人身危险性的态度应当积极而又慎重：一方面，要充分运用现行立法中已有的体现人身危险性因素的量刑原则和量刑制度；另一方面，对立法中尚未包含的但又能体现人身危害性大小的事实要素，在刑罚裁量过程中应当积极而又慎重加以确认和运用。

The naissance of the Personal Dangerousness Theory has caused great changes to the theory of criminal law. Even though the Personal Dangerousness Theory has been generally accepted as a basic concept in criminal law, there is no unanimity concerning its connotation, fucntion and so on which not only negetively affect the legislation on the the Personal Dangerousness Theory but also its application in juridical practices. Here, I interpret the Personal Dangerousness in a narrow way especially from the perspective of the Penology. It refers in particular to the possibility of recommitment. As the Social Harmfulness of a criminal activity and the Personal Dangerousness of the person co-determine the criminal responsibility, the Personal Dangerousness is quite essential to the penalty measurement. To consider the Personal Dangerousness seriously when measuring the penaly reflects the unity of the value of retribution and prevention.The unique value of the Personal Dangerousness in Penalty Measurement has been noted not only by legislation but also judicial practices. To place emphasis on it is an inevitable choice. However, we should also notice that it is quite difficult to accurately measure the personal dangerousness. We must hold a positive and prudent attitude towards the implication of the Personal Dangerousness. On the one hand, we should make good use of the existing sentencing principles and institutions on Personal Dangerousness in legislation. On the other hand, we should positively but carefully apply the factual elements in measuring penalty which can reflect the Personal Dangerousness but has not been confirmed by legislation.