At present, college students' physical decline has become an indisputable fact. As an important driving force of social development, college students' physical quality will play a vital role in the future of the country and the national destiny. How to effectively improve the physique of college students has become the focus of social attention. Therefore, through the investigation of physiological indicators, living habits and sub-health of college students, this paper puts forward the causes of physical decline from the aspects of academic pressure, curriculum system setting, social overall atmosphere and students' attention.