The existing Circuit Breaker Monitoring System (CBMS) suffers from some problems such as information dispersion and is challenging to visualize. To solve these problems and to offer real-time visual monitoring of circuit breaker status, a Service-Oriented Architecture (SOA)-based and Virtual Private Cloud (VPC)-based CBMS (SV-CBMS) is proposed. The SOA architecture is adopted to encapsulate the basic functions of the system into interface services and calls each other to realize the overall function. It has the characteristics of low coupling, easy maintenance, and easy expansion. It deploys the system to the VPC and integrates the advantages of high performance, low cost, strong disaster recovery, and high security of the VPC, thus realizing the interactive and cross-platform B/S mode Web client. As a decision support system, it provides a strong basis for power grid dispatchers to monitor the entire power grid reliably. In this paper, the principle, structure, characteristics and deployment process of the proposed system are introduced in detail. Operational results show that the system improves the safety and stability characteristics of the power system, and meets the reliability requirements of the power grid. It has been applied to the actual power system and has a good application prospect. This work is supported by National Natural Science Foundation of China (No. 51167003).