In this paper, a class of predator-prey diffusive system of two species with time delay and ratio is studied by the using of coincidence degree theory.

• 摘要本文研究了一类具有时滞和比率的两种群捕食者-食饵扩散系统。应用重合度理论。得出了该系统正周期存在性与扩散系数无关的新结果。