In the conventional security protection system, more separated data encryption from user identification authentication, and mainly focused on the former but ignore the latter. In order to address this problem, the dynamic and double encryption system based on two-dimensional image is presented, which combined the identification authentication with file encryption. Our approach is that, in the identification authentication, the system used the way of image authentication which generated on the base of combination of Hmac One Time Password (HOTP) algorithm and current system time in the mobile phone; in the file encryption, the system adopted the Data Encryption Standard (DES) and the encryption algorithm based on time. The experiment results show that the system augments the attack-resistant potential and decreases the mistaken rate utilizing the strong robustness of changeable and limited box. At the same time, the encryption efficiency has been more improved.