In recent years, there are more and more news reports about teenage suicide. Adolescents are in the rebellious stage of adolescence, their own various psychological conflicts than in childhood, and this period of parent-child relationships, teacher-student relationships and peer relationships are more complex than before, and academic pressure has also increased significantly, all of which are likely to form a long-term negative impact on adolescents, so adolescents are also one of the higher risk groups of suicide. Moreover, adolescent suicide is often impulsive in nature, so it needs the attention of parents, teachers and society as a whole. Suicide is defined as a conscious act of self-destruction, ending one’s life by one’s own will or means. The narrow definition of suicide is death by suicide, which is closely related to the concepts of attempted suicide, quasi-suicide, suicidal ideation and self-injury. Why do adolescents in their prime develop suicidal ideation and even behavior? Suicide is not a disease, it is often a personal behavior due to other diseases or causes. Generally speaking, it includes physiological, psychological and socio-cultural factors. Physiological factors include genetic factors, neurobiological changes and mental or physical illness. Especially in adolescents suffering from depression, this mental illness often leads to suicidal ideas and behaviors, and there is also a strong genetic factor, so a family history of depression is one of the high-risk factors for adolescent suicide. 2, psychological factors Suicide is usually caused by stronger negative psychological stimuli leading to internal psychological conflict. Most suicidal people have recently or for a long time encountered a large negative life events such as the loss of a loved one, adolescents encounter this situation is often under great mental pressure, and their ability to self-regulate is still immature, and in the rebellious period of adolescents act with emotional and impulsive characteristics. Some of the teenagers have been introverted, withdrawn, used to self-containment, difficult to share their hearts with others, poor social skills, few social activities, in this case, the child’s psychological capacity will be even worse. 3, socio-cultural factors social pressure and suicidal behavior have a close relationship, leading to an increased risk of youth suicide social environment factors are mainly interpersonal relationship problems and academic pressure problems. Interpersonal relationships can be divided into family relationships, peer relationships and teacher-student relationships. If family relationships are not harmonious, parents often quarrel or even divorce, poor peer relationships or even suffer from school violence, criticized or punished by teachers for various reasons, poor academic performance and overly strict parental requirements are more common adverse social and cultural factors. So, how to identify suicidal ideation in adolescents at an early stage and intervene in time? In fact, suicide can be divided into three stages: 1, the formation of suicidal ideation stage: adolescents encounter their own intractable problems, psychological conflict is intense, the idea of suicide as a means to solve the problem. 2, the stage of conflict between life and death, although the stage of suicidal ideation, but the survival instinct makes it into the conflict between life and death, may hint or talk about suicide with close people, or have other direct or indirect signals of suicidal ideation, etc.. 3, the suicidal behavior selection stage, if they do not get help in the life and death conflict stage, at this time, they are firmly suicidal will, emotions gradually regain calm, no longer reveal suicidal ideation, and make a suicide preparation plan, choose the time to make suicidal behavior. Through these three stages, we can see that there is a certain window of time for others to identify suicidal thoughts and give timely help before the adolescent makes a real suicidal act. Adolescents with suicidal ideation tend to turn to their closer parents, teachers, classmates, etc., and express suicidal thoughts in direct or indirect ways in order to get their help, which can generally be identified by both words and behavior. They often express suicidal thoughts through conversations with others such as: “There’s no point in living,” “I’m useless at all,” “I don’t have anything left to say about it all,” “They may also discuss suicide methods with each other, such as: which method of suicide is the least painful and which methods they know; they may also express similar thoughts in text form through essays, diaries or social networking software. Behavioral aspects are mainly manifested by the sudden appearance of obvious abnormal behaviors such as: an adolescent who used to pay great attention to appearance suddenly does not pay attention to appearance; someone who used to be very petty suddenly becomes very generous; someone who used to be very polite suddenly becomes temperamental and easily provoked; some academic performance suddenly decreases severely, or even misses classes and skips school; many other adolescents will show physical symptoms such as headache without other causes, abdominal pain, mental depression, and Many adolescents may have physical symptoms such as headache, abdominal pain, depression, difficulty sleeping or waking up early, and crying easily. In summary, friends and family can detect suicidal ideation through verbal and behavioral traces, so that they can give timely help and support, especially psychological support so that they can feel the love and acceptance of others, and if necessary, take them to a depression specialist for professional intervention, and avoid scolding or lecturing them. Suicide prevention is a systematic project that requires not only the attention of youth, parents and teachers, but also the attention and participation of the media, the whole society and government departments.