Abstract: Based on the methods of spectral analysis and bifurcation theory，the coexistence state of the competition model with a protection zone is investigated.The bifurcation from the semi-trivial is obtained by treating c and η as bifurcation parameters.Through the use of local and global bifurcation theories，sufficient conditions for the existence of positive solution are derived.Moreover，some stability results of the bifurcation solutions are presented.

摘要： 研究了一类带保护区域的竞争模型的共存态问题，利用分歧理论和谱分析的方法，分别以c、η为分歧参数，讨论了发自半平凡解的局部分支解的存在性，并将其局部分支延拓为整体分支，从而得到正平衡解存在的充分条件；同时判定了局部分支解的稳定性。