In this paper,through the method of the literature,expert interviews,the questionnaire survey and the data statistics we study and analyse on the students' status of sub-healthy,the main symptoms and related factors of Hunan City University.The results showed: 85.27% of students in the condition of the sub-healthy state in the school,the main performance are sleepiness,memory loss,thinking efficiency lower,endurance decreased,emotion unstablization.Cognitive health and sub-healthy bias,evaluation of the bias of their own,lack of physical exe...