侦查活动的结构要素有自身的构成条件和数量上的确定性。根据刑事诉讼构造的设定 ,侦查活动是为解决刑事案件 ,由侦查法律关系主体共同参与行为的活动。因此 ,不同的法律关系主体就成为组成这一活动的基本要素 ,具体分为 :主体要素、客体要素和相关人要素。三个要素各自的诉讼地位及其相互关系体现出侦查活动的内在规定性。 The structural elements of investigation activities have their own conditions and quantitative certainty. According to the setting of the structure of criminal procedure, investigation activities are the activities of investigating criminal cases and investigating the legal participation of the subjects in their joint activities. Therefore, the main body of different legal relations has become the basic elements of the composition of this activity, divided into: the main elements, the object elements and related elements of the people. The litigation status of each of the three elements and their relationship reflect the inherent stipulation of the investigation.