By using the methods of literature, questionnaire, field observation and mathematical statistics, this paper focuses on the unhealthy sports behavior of college students in the new century. The main problems of unhealthy sports behavior of college students in the new century are as follows: (1) lack of sports consciousness and sports theory knowledge. 2. Weak will power in sports, especially girls, afraid of sweating, afraid of bleeding, afraid of injury. 3. Lack of coping strategies for self protection and injury in sports. 4. Do little or no preparation and relaxation exercises before and after exercise. 5. Binge eating after exercise. 6, stay up late or continue to exercise after an empty stomach, ignoring the danger of staying up late and being empty. 7. Sports professional skills are not standardized, sports technology is not up to standard. The unhealthy sports behavior problems of college students are caused by students themselves, school, social environment and other factors. The suggestions are as follows: 1. Strengthen the fusion of Physical Education and Health Education, change the thought, set up the new concept of physical education and health education. 2. Give full play to the role of physical education teachers in school physical education. 3. Reform the current teaching mode of physical education course, introduce the teaching of Sports Club, bring into play the leading role of the backbone students of physical education. 4. Improve the construction of stadium in colleges and universities, expand the number of sports venues, and provide an external environment for students to exercise.