我們分析具時滯參數之 Lotka-Volterra 互利共生系統之整體穩定性。首先，我們利用三種不同的方法分析不具時滯參數之Lotka-Volterra 互利共生系統之整體穩定性。緊接著，我們分析具時滯參數之Lotka-Volterra 互利共生系統之整體穩定性。最後，我們用實例及電腦軌跡圖說明之。

In this paper, we are concerned with the dynamical behavior of a two-species Lotka-Volterra mutualistic system with time delay. First of all, we use three different methods to discuss the global stability of the unique positive equilibrium point of a two-species Lotka-Volterra mutualistic system without time delay. Secondly, we study the change of the global stability for a two-species Lotka-Volterra mutualistic system with time delay. Finally, we illustrative our results by some examples.