With the improvement of human living conditions, the advancement of medical science and technology and the shift in the spectrum of causes of death, suicide has risen to the top ten causes of death for all human beings, and in many countries, suicide is even the first cause of death in certain age groups, and has become a serious public problem. According to the World Health Organization, nearly 1 million people died by suicide worldwide in 2000, with a “global” suicide rate of 16/100,000, or about one death every 10 seconds. In the past 45 years, the suicide rate has increased by 60%; it is estimated that without effective interventions, the number of deaths by suicide will reach 1.5 million annually worldwide by 2020. Studies of the global burden of disease have demonstrated that suicide deaths account for 14.8 percent of the disease burden. The China Injury Report, published by the Bureau of Disease Control and Prevention of the Ministry of Health in 2007, estimated that there were 193,000 suicide deaths in China in 2005. According to a study by the University of Hong Kong, between 2002 and 2011, China’s average annual suicide rate dropped to 9.8 cases per 100,000 people, a 58 percent drop, and has fallen to the lowest in the world. One of the biggest shifts was a 90 percent reduction in the suicide rate among rural women under the age of 35. Suicide is related to many factors, and suicide rates vary widely by country (geography), from low in countries such as Ireland and Egypt (below 10 per 100,000) to high in the Baltic States (above 35 per 100,000). In most countries of the world, the gender ratio of suicide deaths is about 3:1, with men being higher than women. Among attempted suicides, there are more women than men, with a sex ratio of about 1:3. In our country, the sex ratio of suicide mortality is about 1:1. In most countries and regions of the world, suicide rates increase with age. In developed countries, the suicide mortality rate of the female village population is much lower than that of the urban population, while in China it is exactly the opposite. Married people have significantly lower suicide mortality rates than divorcees, widows, and unmarried people of marriageable age. There is a clear relationship between ethnicity and religion and suicide, such as suicide bombing, which is often used in West Asian regions and countries. Most scholars believe that medical workers and lawyers have higher suicide rates than other occupational groups, although in recent years our top officials have emerged as the frontrunners for this natural phenomenon. Analysis of the causes of individual suicide from a biological and medical perspective shows that mental disorders are the biggest culprits of suicide, with patients with mental disorders contributing up to 60% of the suicide mortality rate, while depression accounts for 66% of the suicide mortality rate for mental disorders, and schizophrenia, alcohol dependence, and drug dependence addiction become the remainder of the contribution to suicide. Infectious diseases like AIDS, sexually transmitted diseases, and certain chronic wasting diseases like neurology, endocrine, rheumatism, and cancer are somatic factors that contribute to suicide in patients. As far as suicide prevention is concerned, the key lies in mastering the assessment of suicide risk. Generally speaking, the following factors should be high risk factors for suicide: age > 45 years, male, divorce, widowhood, unmarried people of appropriate age, unemployment, conflicting interpersonal relationships, chaotic or conflicting family relationships, chronic illness, hypochondriasis, overmedication, severe depression, schizophrenia, severe personality disorders, substance abuse, pessimism and disappointment. suicide attempters, social isolation, lack of family warmth, little achievement, lack of legal insight, poor emotional control, people who have not released or catharticized their bad feelings in time after major trauma, etc.