This paper summarises the development of an innovative mobile application on healthcare Health Guard system using the smartphone. The system has incorporated a number of important features including location-based service, automatic falling detection and cancellation system and is build on cloud computing. The system detects the stumbling or the crash encountered by the mobile user. The automatic falling detection system will be triggered and judge whether the user in a perilous position. Meanwhile, the pre- defined contact persons will be alerted by a SMS sent from our system. The useful information including the location of the user and the route which can enable to reach the mobile user in danger will be sent through the cloud to the website. The contact persons can correspondingly see the necessity of reporting to the police. A number of tests have demonstrated the applicability of the system.