Military training in colleges and universities is a serious training activity, which aims to cultivate students' discipline, team spirit and physical quality. In order to ensure that students concentrate on training and abide by the regulations, many universities require students to hand in their mobile phones during military training. The practice of handing in mobile phones helps to reduce the possibility of students being disturbed by mobile phones, so that they can devote themselves to military training activities. Handing in the mobile phone can also ensure the safety and confidentiality of students and prevent unnecessary problems or disclosure of military training related information during military training.