本文针对DDos攻击时源端IP地址分散且呈随机分布的特点,提出了利用k阶中心矩的方法来检测是否遭受DDos攻击。该方法具有反应速度快、容易部署、能实时了解网络通信流量等优点,能够在较少的DDos攻击量时准确的检测到DDos攻击,是一种简单有效的DDos入侵检测方法。 In this paper, for the DDos attack, the source IP addresses are scattered and randomly distributed. We propose a method to detect DDos attacks using k-th order moment. The method has the advantages of fast response, easy deployment and real-time understanding of network traffic. It can accurately detect DDos attacks with a small amount of DDos attacks and is a simple and effective DDos intrusion detection method.