Adolescence refers to the stage when an individual's sexual function changes from immaturity to maturity. In biology, it refers to the transition period from immaturity to maturity, that is, the transition period from children to adults for men. During this period, my personality is mature and I can have children. It can be seen that adolescence is mainly divided into stages of physiological maturity, which overlaps with the stages of life divided from psychological or social aspects. In the stage of human growth and development, adolescence accounts for half or even more time. At present, there is no consistent age range in various countries, which generally refers to 13, 14-17 and 18 stages. Psychologically, it is also called pre-adolescence, which is equivalent to the middle school stage in pedagogy and is characterized by rapid physical growth. In addition to adolescence, adolescence will last until the age of 25-30. Because the sexual maturity of men is about one year later than that of women, it can be determined that the puberty age range of men is 14- 18 years old. 1 ~ 2 years too early or too late is normal. Men of this age are usually called boys, while women of the same age are called girls. In adolescence, there are not only obvious physiological changes, but also great psychological changes. Physical growth with sexual maturity as the main content has a great influence on the psychological and social aspects of teenagers, forming several important characteristics of this period: adolescence is a transitional period, and adolescence is a period for individuals to transition from children to adults. Usually, people clearly distinguish between adolescence and childhood, and the dividing line is sexual maturity. For men, the sign of sexual maturity is ejaculation (usually ejaculation during night sleep, that is, nocturnal emission, but also masturbation ejaculation); Women have menarche, that is, the first menstruation. The physiological development centered on sexual maturity makes teenagers have obviously different social and psychological characteristics from children. Individuals depend on adults in childhood, and adults constrain and decide the main contents and aspects of children's lives and activities; Children are not responsible for their actions. With the increase of age and the complexity of life scope and activities, teenagers have different characteristics from children. They gradually have a certain intention and sense of responsibility, and decide how to carry out certain activities by themselves. You should bear certain criminal responsibility for your actions, especially some criminal acts. But teenagers are also different from adults. Although they have some independence, they are not completely independent; In many ways, especially in material life, we have to rely on our parents; They have not yet become fully responsible persons and are not criminally responsible for all their actions. It can be seen that this transitional state between children and adults makes teenagers become marginalized people in sociology. The uncertainty of their identity and the uncertainty of social demands on them have caused many special mental health problems. Adolescence is a period of development. Adolescence is the period when human development is completed. Research shows that there are two stages in a person's life: the rapid growth of the body and the significant changes in the proportion of various parts of the body. One is in the prenatal period and the first half year after birth, and the other is adolescence. The rapid growth and development of adolescence is called the phenomenon of rapid growth of adolescence. In fact, this phenomenon begins before or at the same time as sexual maturity and ends six months to one year after sexual maturity. The rapid growth of men began at the age of 10.5- 14.5, peaked at the age of 14.5- 15.5, and then gradually slowed down. By the age of 18, the height has reached a fully developed level, and the weight, muscle strength, shoulder width and pelvic width have also increased. For example, while women are experiencing external changes such as menstruation and secondary sexual characteristics, the reproductive organs gradually mature, pubic hair begins to appear in the vulva, vaginal secretions begin to increase, the uterus becomes larger, and follicles in the ovarian cortex begin to develop at different stages. Everything shows that the transition to sexual maturity has begun. Due to the physical and sexual development, it has a great influence on the psychological characteristics and social life of teenagers, which also produces a series of mental health problems. Adolescence is a period of change. Adolescence is the most rapid and obvious period of physical and mental changes of teenagers. During this period, men are divorced from the characteristics of children in terms of body, appearance, behavior pattern, self-awareness, communication and emotional characteristics, and outlook on life, and gradually become mature and close to adults. These rapid changes will make teenagers have mental health problems such as confusion, inferiority, anxiety and even bad behavior. Therefore, adolescence is a predictable and unpredictable period. That is to say, in this period, the development of people from children to adults is predictable, but what will happen or what problems will occur in the development process is unpredictable. Adolescence is a period of resistance. In the early days, Charlotte Buller, a famous German child psychologist, once called adolescence "a period of passive resistance". This name has been used to this day. Due to the gradual development and maturity of body and mind, individuals often take a negative and rebellious attitude towards life during this period, denying some good qualities they have developed before. This rebellious tendency will make teenagers resist other requirements and norms of parents, schools and social life, which will lead to some mental health problems that are not conducive to their social adaptation. Adolescence is a period of heavy burden, and all kinds of obligations and responsibilities are borne by adolescent men. Judging from the problems they have to deal with, adolescence is also a period of heavy burden. Adolescence is a transitional period. Teenagers should gradually undertake some tasks undertaken by adults, and the environment may constantly hand over some things handled by adults to them, which will increase their burden, but these burdens are indispensable for their maturity. If they are not burdened, they will not mature in the future. Adolescence is a developmental period, which determines that they have to deal with various changes and problems brought about by the maturity of height, weight and muscle strength. Especially when they are sexually mature, their psychological pressure increases relatively fast. Adolescence is a period of change, which determines that they must abandon all kinds of childish ideas and behavior patterns, and gradually establish more mature and more in line with social norms. Adolescence is a period of resistance, which determines that we should try our best to maintain and protect the normal relationship with society while coping with our own resistance tendency. In addition, heterosexual interests, heterosexual communication, and heavy learning tasks. It also causes great burden to their body and mind, and sometimes even becomes the main contradiction.