Based on the K-M model assumption of the infection diseases model, a SIRS infections disease model is discussed that the whole population is divided into two groups by both age: immature, mature and isolation: isolation, non-isolation.

• 摘要在传染病模型K-M三假设的基础上，进一步的将整体人群按年龄层次分为两个阶段结构，同时考虑对传染病的积极干预，即将染病人群分为染病未被隔离和染病即被隔离两种状态。