3 . we construct liapunov functions with separable variables and prove results on global stability with respect to partial variables for nonlinear and non - autonomous systems with separable variables 三、利用分离变量的liapunov函数,研究了非线性非自治分离变量系统关于部分变元的全局稳定性,将一般自治系统的相应结果推广到非自治系统。