正当防卫作为一种违法阻却事由,它在打击违法犯罪、鼓励公民与正在进行的不法侵害作斗争方面发挥了积极的作用。在司法实践中,防卫行为通常以暴力形式所出现,这就要求在在司法实践中对正当防卫的认定应充分考虑具体案情,根据正当防卫的成立条件慎重认定。本文以正当防卫的意思条件为出发点,通过案例评析的方式对偶然防卫问题展开讨论。 As a cause of illegal obstruction, due diligence has played a positive role in combating crimes and encouraging citizens to fight against ongoing unlawful violations. In judicial practice, defensive acts usually occur in the form of violence. This requires that due diligence be recognized in judicial practice, due consideration should be given to specific cases and cautious on the basis of the conditions for the establishment of proper defense. In this paper, starting from the meaning and condition of justifiable defense, this article discusses the problem of contingency defense through the way of case analysis.