Based on UTAUT model, the paper combines security and privacy factors to build user adoption behavior model for medical cosmetic APP, and conducts questionnaire survey and structural equation verification. The results show that users' expected performance and effort expectations of medical cosmetic APP are affected by social factors, while users' actual usage behavior is directly affected by convenience conditions and the willingness to use, and indirectly affected by expected performance, effort expectations, social impact, security risk and privacy risk.