对一类三次系统{x'=-y+δx-ny3+ Lx3=P(x,y),y'=x+ax3=Q(x,y).在(a＞0,n＞4)情况下进行了定性分析,并得出系统极限环的存在性,唯一性及不存在性的一些条件.%This paper makes a qualitatice analysis for a class of cubic systems with (a > 0,n >4)of the form {x'=-y+δx-ny3+ Lx3=P(x,y),y'=x+ax3=Q(x,y).and gives sufficient conditions for the existence, uniqueness and nonexistence of limit cycles for such systems.
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