To match to the development of the concurrency and expansibility requirements of multiuser static security analysisin power dispatching systems, this paper analyzes the characteristics of static security analysis and calculation, and combines it with docker technology.Based on Docker technology, astatic security analysis cloud computing application method is proposed for designing the operation architecture of the application. In this method, Docker container images are generated corresponding to different power flow algorithms, and the data exchangebetween users and containers are realized by using Protobuf. New containers are dynamically created and idle containers is allocated according to the calculation request. Containerswill be released once the calculation is finished. This method uses Docker technology to improve the utilization of cloud platform computing resources, and meet the concurrent requirements of static security analysis calculation function. The case studiesshow that the proposed method can effectively utilize the computing resources and extend the concurrency and extensibility of static security analysis.