This paper presents a description of the intelligent-lock model which could remotely share its key through smart phones. It also provides a set of hardware models that make the whole system function normally. The facility of sharing the keys is surprisingly rare in today's field of intelligent locks. Instead, the combination of different means, such as passwords, access cards, fingerprints, and Bluetooth, is widely used to unlock intelligent locks. But as is shown in this paper, the RSA algorithm makes a better effect on realizing the keys' confidentiality and timeliness while sharing the keys. As for hardware system, for instance, used for unlocking through fingerprints or access cards, we can also find a workable design based on the controller made by low-power STM32F103 single chip. The result shows that the system can actualize the function of sharing keys well.