Internet popularity has exacerbated the problem of telecommunication network fraud.Using rootedness theory, this study interviewed 29 respondents with experience of telecommunication network fraud, and constructed a model of the interaction mechanism between the fraudster and the victim, containing five core categories: fraudulent means, victim psychological process, behavioural performance, personality tendency, and victim situation.The fraudster commits fraud by fabricating a scam, promoting a scam, and identity disguise.Victims experience a contact period, an in-depth period, and an awakening period throughout the fraud process, with significant psychological and behavioural changes ensuing.Contact period, by the herd, curiosity and other psychological influences, the victim will ask others, Internet search and other ways to determine the authenticity of information; in-depth period, unwillingness and urgency of the psychological dominance, leading to blindly follow the instructions of the fraudster, even if there is a suspicion of self-persuasion; awakening period, the victim’s heart is full of anger, remorse and other complex emotions, the behaviour of the diversified, such as venting their emotions, and to seek external help and so on.At the same time, in addition, the victim’s personality tendency (such as high pleasantness, openness) makes it easier to gullibly trust others, increasing the risk of fraud; the personal space environment, emotional state, and social environment factors in the victimised situation also play an important moderating role in the fraud process.This study reveals the dynamic interaction between the factors of telecommunication network fraud from a new perspective, providing theoretical support for understanding the phenomenon.