In order to dynamically evaluate the security of network equipment operation, a security evaluation method of network equipment based on alarm data is proposed. The method makes full use of the alarm log containing network equipment running rules and status information, deeply analyzes the distribution of alarm type and puts forward a new algorithm AoR to evaluate Alarm event for network equipment damage value, then get the safety index of network equipment and quantitative description of the network security equipment running status. Finally, the experiment shows that the network equipment security assessment model proposed in this paper can find the high-risk network equipment and provide effective decision support for network security operation and maintenance personnel.