One Time Password (One Time Password) is a security system that isolates external attacks. Using an excellent password security verification mechanism is the first line of defense against attacks. The most common method of network intrusion is to steal user account passwords. In general password systems, simple and easy-to-remember passwords are easy to guess, while complex ones are difficult to remember. Various human factors in use lead to unsafe results. Using the dynamic password (OTP) mechanism, the password generated by random numbers generates different passwords each time according to the event, and is only used once; even if the hacker intercepts this one-time password, it will be discarded immediately after it is used, which is the highest security and trustworthy. The security password of the same level cannot be applied to the next login.