The research is based on the project of “the big-data platform of intensive care for disaster and emergency public health e-vent”. Because the project involves the medical institutions and doctors,patients and other large medical information network transmis-sion,the design of system security is particularly important. The existing security model is analyzed from four levels including the system, program resource access control,function and data domain,finding out their limits and shortcomings. Then according to the existing safety problems,a new security model of application system is designed based on cloud computing. The model is based on the mature of virtual-ization technology,in pursuit of high availability,scalability,security as the goal,with a triple security mechanism. It has offered a whole security design scheme to ensure the smooth implementation of the project. The test through the project shows that the security design can make the platform information will not be easy to leak,thus protecting the rights and interests of users.%基于四川省“灾害与突发公共卫生事件重症救护大数据平台”建设项目展开研究。由于项目涉及到医疗机构、医生、病人等大量医疗信息的网络传输，对系统安全性的设计显得尤为重要。从系统、程序资源访问控制、功能性、数据域四个层次分析了现有的安全模型，找出了其中的限制与不足之处。根据现有的安全隐患，设计了新的基于云计算架构的应用系统的安全模型。该模型以成熟的虚拟化技术为基础，以追求高可用性、可伸缩性、安全性为目标，具有三重安全保障机制。以此模型提出项目的安全解决方案，确保项目的顺利实施。通过项目的运行检测，结果表明该安全设计方案可以保障平台信息不会轻易泄漏，从而保护用户的权益。
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