Abstract <p>In order to ensure the security of identity authentication of electric power, financial and other terminal products, this paper proposes a security operation method based on security chip identity authentication. There are four main methods of this method, which need to be completed with corresponding instructions: The first is the authentication identity method. The security chip needs to send the “verify identity authentication pin” command to the interface device. After the verification is passed, the interface device can legally read and write to the security chip. The second method is to unlock the identity, need to execute the “unlock identity authentication pin” command, this method can make the locked security chip restore normal operation. The third method is to reset the identity, which needs to execute the “reload identity authentication pin” command, which can set the user’s identity authentication pin to the newly entered identity authentication pin, so as to ensure the restorability of the authentication. The fourth is to change the identity method, the security chip needs to execute the “change identity authentication pin” command, this method can update the original identity authentication pin to the newly entered identity authentication pin. Based on actual application security requirements, users can use the four types of commands to reasonably combine applications, select different security operation methods, and perform corresponding application functions such as verify, unlock, reload, and change identity authentication pin, so as to achieve secure operation of the security chip authentication pin. Identify whether the identity authentication pin is in a locked state in response to commands such as verify identity authentication pin, unlock identity authentication pin, reload identity authentication pin, or change identity authentication pin. Recognizing that the identity authentication pin is in a locked state, it is prohibited to execute the verify identity authentication pin command and change identity authentication pin command; it is allowed to execute the unlock identity authentication pin command and reload identity authentication pin command to unlock identity authentication pin. Therefore, after the identity authentication pin is locked, the identity authentication pin can be unlocked based on the unlock identity authentication pin command or reload identity authentication pin command, so that the security chip can continue to be used while meeting security requirements.</p>