KRID (Katherine intelligence detector) was designed according to the immune danger theory principle to solve the problem that traditional detector had low detection rate and high false rate, and its self set was huge and complicated. The MSMA (multistage similar miracle algorithm) matching method and KRNA (Katherine navigate algorithm) based on immune danger theory were also proposed. Different matching method was used according to different type of danger signal for layered detection. Experimental results show that KRNA has low detection rate,...