To solve the voice echo problems in VoIP,presents an improved variable step size LMS algorithm.Improved algorithm converges in larger step sizes can quickly eliminate echo,after the convergence step size becomes small to reduce the steady-state error,so the contradiction between the convergence rate and steady-state error can be improved.The simulation results show that the algorithm can get faster convergence speed and better effect of echo cancellation.%为解决VoIP中语音回声问题，给出了一种改进的变步长LMS算法。改进算法在收敛时具有较大的步长，能快速消除回声，收敛后，步长变小，以减小稳态误差，使收敛速率与稳态误差之间的矛盾得到改善。仿真结果表明，改进算法的收敛速度和回声消除效果较好。
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