Abstract: As the key information infrastructure such as power and its system equipment systems has gradually become the hardest hit area of network attacks, the network security situation they are facing has become increasingly severe. State Grid Corporation of China has put forward higher requirements for power system network security. As an important communication channel of power system, power data communication network still has some shortcomings. Aiming at the problem that the search speed of passive detection of power data communication network equipment is not high, this paper proposes a new method to quickly find vulnerabilities. It uses the cache idea to establish a two-level cache database. It uses the page adaptive replacement cache replacement algorithm idea and the moving average algorithm as the hierarchical rule to select the more priority CVE to store in the first level cache. The search speed of CVE is greatly improved through gradient search. It reduces unnecessary waste of computing resources. The experimental results show that the algorithm can significantly improve the speed of device vulnerability detection in the power data communication network, and help the power data communication network to efficiently complete the device network security vulnerability detection.