Abstract: On the basis of analysis of the oscillations and chaos in the o-NH₂C₆H₄COOH BZ reaction system reproted in paper I, this paper proposes a reasonable Otegonator type model about BZ oscillation reactions, and simulates the oscillating and chaotic behaviors corresponding those observed in cxperiments. The numerical results are compared with the experimental results in the view of the potential-time curve of bromide, phase space, Poincare map, first return map and fractal dimension, and indicate that the model can simulated the periodic oscillations and chaotic oscillations qualitively. The studies on the medium products lead to a found that the concentrations of HBrO₂ and HOBr change monotonously during the small amplitude oscillations of the concentration of Br^- before a large-amplitude excursion, which suggests that HBrO₂ and HOBr maybe not take a part in small amplitude oscillations. Moreover, the influences of some unreliable parameters on oscillaton behaviors arc discussed.