中文摘要：

软件系统安全问题日益严峻，软件生存性研究成为软件安全性研究的延伸和拓展，但是目前的生存性模型很多都不能提供一个可以指导实践的方法。该文研究系统结构和运行环境对系统生存性的影响，在服务的生存性模型中，考虑不同的环境对于服务生存性的影响，在进一步构架系统的生存性模型时，引入系统架构和服务之间的关系，以服务生存性为基础定义系统生存性。以该形式化的生存性模型为基础，结合系统运行环境给出了一个系统在提供的部分或全部服务失效时的恢复方案。

英文摘要：

The security problems of software become more and more serious,and software survivability is an extension of software security researches. However, the survivability models can rarely bring out a practical method by now. In this paper, we consider the effect of different system structures and runtime environments on system survivability. Firstly, we construct a service survivability model by considering the effect of environment;secondly, we consider the relationship between the system structure and services and construct a model based on service survivability to reflect the system survivability. Finally, based on this model, a recovery approach is illustrated when parts of or all the system’s services are failed.