本文研究Liénard方程x＋f（x）x＋g（x）＝e（t）的解的有界性及整体渐近性态，并获得了所有解及它们的导数有界与收敛于零的充要条件．

In this paper, the boundedness of solution and the global asymptotic behavior of Lienard equation is studied. Necessary and sufficient conditions for all solutions to be bounded and for all solution to have their derivatives convergeing to zero are given.