With the development of Internet, more and more people express their own feeling on the social media, including suicide declaration, which create new opportunity for the identifying, preventing and intervening of suicide high risk group. The influencing factors of suicide behavior are numerous, mainly including internal and external factors. Internal factors include biological factors, mental disorders and psychological factors; external factors include negative life events, family factors, social environment factors and cultural factors. Systematic intervention of Internet is used to establish an automatic identification and assessment of suicide ideation in social media, and a mental psychotherapy with many other psychotherapies. Through timely intervention and referral, systematic intervention and continuous care intervention process, social media users can eliminate suicide idea and reduce suicide probability. At present, researchers pay more attention to the development process and mechanism of suicidal behavior. In the future, it will be necessary to establish Internet suicide intervention system and study the effect of different psychological intervention on Internet suicide. © 2019, Springer Nature Switzerland AG.