本文针对MANET 中现有的通用IDS 模型存在消耗太多的计算和带宽资源、容易受到DOS 和欺骗攻击以及准确性较低等不足，提出了改进的基于簇的多层协同入侵检测模型。该模型具有较好的扩展性、灵活性和准确性，比较适合带宽和计算能力有限的MANET。关键词：移动自组网；入侵检测系统；簇；协同Abstract: In order to overcome the disadvantages of too much computation and bandwidth consumption, being prone to Denial of Service and spoofed attacks, and low accuracy in the current general intrusion detection model for MANET, an improved cluster-based multi-layer cooperative intrusion detection model is proposed. The model is more scalable, flexible and effective，more applicable to MANET that has a limited bandwidth and computation capability.Key Words: MANET；Intrusion detection system (IDS)；Clustering；Cooperation