With the development of mobile digital devices, self-tracking is more and more associated with mobile technology. Different forms of technology entail different data practices. Taking the "Sports World in Campus" APP used by GMY college students as an example, this paper focuses on the role of media technology factors, especially the "medium characteristics "in data practice. "Sports World in Campus" APP, as the locative media, has the characteristics of the co-presence of body/technology/space. As a type of "imposed self-tracking", the interaction between the body and technology, in the "running in campus", creates a "hybrid space", which in?uences the perception of the body and regulates the relevant activities of the body. "Running in campus" not only makes teachers gaze at student's daily exercise and discipline their running behavior, but also provides the possibilities for students to cheat. In this process, human and non-human factors are interconnected and forming a special data practice, through the mediatization of technology.