本文以《侵权责任法》第10条条文为中心,从民事诉讼法学原理出发,结合民法解释学相关方法,就诉讼实践所要解决之共同危险行为之构成要件与免责事由进行了梳理。笔者认为,应根据共同危险行为所涉不同归责原则识别共同危险行为的主观构成要件,加害人不明不应作为客观构成要件,从法律上的事实推定制度的原理出发,应当采用因果关系排除说作为行为人的免责事由。 Starting from the principle of civil procedural law and combining with the relevant methods of civil law hermeneutics, this article focuses on the constitutional elements and exemptions of the common dangerous act to be solved in litigation practice. The author believes that according to the principle of different imputation of common dangerous behaviors, the author should identify the subjective constitutional elements of common dangerous behaviors. The unidentified perpetrators should not be regarded as objective elements. Based on the principle of legal de facto system, As a perpetrator’s exemption.