摘要
由经典的SIS模型出发，加上周期治疗措施，并考虑了治疗效果，得到脉冲方程，通过把其化为差分方程并获得差分方程的解，得到了流行病趋于消亡的条件，数值模拟说明了结果。
Based on the SIS epidemic model, with periodic cure and its effect of this cure, the impulse equation of the model with periodic cure and its effect of this cure is obtained. By changing this impluse equation into difference equation and requiring this solution, the condition for epidemic disease is gained. Finally, some numerical simulations are also shown to verify the results.
