The purpose of this project we will find the disadvantage and behavior of the most people in using smart phone and we will find about harmful effect on both of health, behavior and danger occurs. We will study about the habit of the people in using smart phone. We must explore and interview people in the university to keep information about using smart phone in each day of them and about symptoms of using smart phone too much. Eventually, the result of this research will answer level of risk about behavior of them. And we will analysis approach in using smart phone correctly.