Abstract: As the popularity of electronic-controlled locks, the intelligent lock contorlled by cellphones begins to spring. However, it deserves to further study and improve its communication security. According to the detailed rationale of KeeLoq codec algorithm and the induction of previous attack researches, the security lack of KeeLoq codec algorithm was indicated. Taking example by 3DES algorithm, the triple KeeLoq codec algorithm was proposed to increase the crack difficulties, which its security was better improved. Associated with the bluetooth communication technology and the design method of Android applications, the triple KeeLoq codec algorithm was implemented in the design of intelligent locks. Due to multifarious software-based keys, the intelligent lock owns overwhelmed advantages of lowcost, high security, humanity and green environmental protection.