在以公权力为主导的刑事诉讼中,私力性质的因素开始越来越多的介入其中并发挥独特效用。私力救济作为诸多私力因素中最具代表性的一种,在概念、价值等方面都还存有争议。而刑事诉讼中私力救济行为的正当性则是探究这一问题的关键所在,文章通过对正当性及其边界的分析,以使人们对私力救济形成一个科学全面的认识,善待私力救济。 In the public power-led criminal proceedings, the nature of the private power began to intervene more and more and play a unique role. As the most representative one of many personal factors, self-help remedy is still controversial in terms of concept and value. However, the legitimacy of the private remedy in criminal procedure is the key to explore this issue. Through the analysis of legitimacy and its boundary, the article makes people form a scientific and comprehensive understanding to private remedy, .