In this paper, we propose a predator-prey model in immune response, and analyze the model mathematically.The conditions for the existence and uniqueness of limit cycles in the model are proved;

• 摘要本文建立了一个有关免疫反应的捕食者－被食者模型，并对模型进行了一定的数学分析，证明瞭模型存在极限环和存在唯一极限环的条件；