| 1. | This article studies the existion of homoclinic orbit bifurcation of sirs modle , moreover , it determines the relative location of stable manifolds and unstable manifold of hyperbolic fixed points of this system , therefore , it shows the parameter range of existing limit circle
本文讨论了具有暂时免疫传染病模型同宿轨道分支的存在性，利用melnikov函数确定了该系统双曲不动点的稳定和不稳定流形的相对位置，从而给出存在极限环的参数范围。 |
