For the problem of shape-space in the immunity-based intrusion detection system(IIDS), by using the epitope
constitute of immune cells and discrete topology theory, a new method, named neighborhood is proposed. Furthermore,
the corresponding matching rules and detectors generating algorithm are given. Experimental results show that, the new
shape-space can solve the defects of real-valued representation, increase the efficiency of detector generation effectively, and
improve the system’s detection rate.