Abstract: Because of peer-to-peer system structure and node resources limitation, Ad hoc network faces more safety threat than the traditional network．In recent years,the malicious program research has become an international network and information security field forefront and one of the most active research directions in wireless network malicious programs,also a new research field of hot．We first analyzed the Ad hoc network architecture and security threats,common malware classification and the biological modeling propagation model,then from the SIR virus propagation model of differential equations of the model,aiming at problems for the model to use wireless Ad hoc network,through the introduction of network topology characteristics and immune delay and other concepts of malware propagation model,improved network topology,and combining the dynamic evolution of malware propagation process,designed an improved algorithm and dynamic immune strategy．Considering of the network virus propagation characteristics,network characteristics and immunization strategy,a simulation experiment analysis of the improved model was made.The experimental results show that both immunization strategy and node have effects on malware propagation．

Key words: Wireless Ad hoc network,Malware,Propagation model,Immune strategy