摘要
讨论某些高次多项式微分系统的如下问题：（１）奇点在第一象限的全局渐近稳定性；（２）Ｈｏｐｆ分岔；
,The following polynomial differential systems of high degree are discussed:(1) The overall asymptotic stability of finite singular points in the first quadrant; (2) The Hopf bifurcation; (3) The existence and nonexistence of the limit cycle.
