【摘要】 本文对一个食饵种群具有常数收获率的和具有第Ⅲ类功能性反应的捕食系统作了较完整的定性分析，讨论了分界线的相对位置和分界线环的存在性、稳定性，得到了极限环存在性和唯一性的条件．更多还原

【Abstract】 In this paper,the authors give an almost complete qualitative analysis to a predator-prey system with constant-rate prey harvesting under type-Ⅲ functional response,have a discussion on relative position of separatrixs and existence,stability of separatrix cycles,and obtain conditions of existence and uniqueness of limit cycle.Keywoads:Predator-prey system,constant-rate harvesting,type-Ⅲ functional response,qualitative analysis更多还原