Identity authentication method and system

The invention discloses an identity authentication method and system. The method comprises the following steps: collecting biological data and behavior data of a user; constructing multi-modal integrated biological recognition by using user biological data, and learning user behavior data by using a deep learning algorithm; identity authentication is carried out by using a biological recognition method when a user logs in, and user behavior detection is carried out by using a scoring algorithm after authentication succeeds; and if abnormal behaviors are detected, carrying out secondary identity authentication by using multi-mode integrated biological recognition. According to the identity authentication method provided by the invention, by setting multi-factor authentication, the identity authentication strength is enhanced, the identity authentication security is improved, and different authentication modes and steps can be combined, arranged and matched according to security and secrecy level requirements,