Healthy behavior is a psychological term, which refers to all kinds of activities that people carry out in order to enhance their physique and maintain their physical and mental health, such as adequate sleep, balanced nutrition and exercise. The function of healthy behavior is not only to make people constantly strengthen their physique, maintain good physical and mental health, and prevent diseases caused by various behavioral and psychological factors, but also to help people form healthy habits. Healthy behavior is the key to ensure physical and mental health and prevent diseases. Healthy behavior should be defined based on four aspects: physical health, mental health, moral health and social adaptation to health.