A new modified mathematics model is proposed based on fuzzy mathematics theory and adaptive weighted algorithm aimed at how to analyze the influence on communication network security. The proposed model is associated with the attention degree on security defense is executed. In the proposed model, the communication network security threat, communication network attack approach, network security character and network security counter character are quantified, and influence on communication network security on the condition of security defense is carried out effectively is analyzed quantificational and is modeled. The effectiveness of the algorithm is proved by the simulation results.