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中文摘要：
研究一类三物种的捕食．食饵模型，两捕食者竞争同一种食饵，其功能反应函数分别为HolingⅡ型和Beddington—DeAngelis型．在一维情况下，主要利用局部分歧理论和度理论得出在（d2^（j）,U）处可以产生分歧，同时利用全局分歧理论得出局部分歧可延拓成整体分歧，且连通分支Гj确白无穷．
英文摘要：
A predator-prey system between three species is discussed. Two predators with Holling II functional response and Beddington-DeAngelis functional response compete for the common prey. In a one dimensional case, the bifurcation at the point（d2^（j）,U）are studied through the local bifurcation theorem and the degree theo- rem. At the same time, by means of global bifurcation theorem, it is proved that the local bifurcation can be extended to global bifurcation and the continuum loins un with infinity.
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