We find that there are some mistakes in paper [ 2 ] . in particular , the conditions for the uniqueness of limit cycle in [ 2 ] can not be realized . all of these mistakes have been corrected in this paper . we give an example in the end of this paper to illustrate that our conditions on the uniqueness of limit cycle can be realized 在文[ 2 ]中,我們發(fā)現(xiàn)多處錯誤,尤其是極限環(huán)唯一性的條件不能實現(xiàn)。本文不僅改正了其錯誤,而且在文章后部分舉例說明我們所得的唯一性條件可以實現(xiàn)。