This book is written by a group of experts who are deeply concerned with the health education of teenagers. This book is to teach some basic and normative physiological and psychological knowledge that are easy to accept for teenagers. The book upholds the principle that the knowledge transfer should be in accordance with the characteristics of different grades of secondary school students, while paying attention to the solving of common physiological and psychological problems in daily school life, grooming, and highlights the issues that can have significant impacts on physiological and psychological health of secondary school students. It has a good effect on the physiological and psychological health of middle school students.