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针对lP电话中回声路径稀疏冲激响应的结构特征，分析比较了四种成比例自适应算法的性能。结果表明：在稀疏回声路径条件下Sc－MPNLMS算法与MPNLMS算法性能相当，要优于lPNLMS算法和PNLMS算法；而在色散回声路径条件下Sc－MPNLMS算法与lPNLMS算法性能相当，要优于MPNLMS算法和PNLMS算法。“,”To deal with this structure characteristic of sparse impulse response in lP echo cancel atio,four proportionate NLMS al-gorithms are summarized in this paper.Simulation results show sparseness control ed MPNLMS (Sc-MPNLMS) algorithm ob-tains a faster convergence rates than lPNLMS algorithm in sparse circumstances.Moreover,Sc-MPNLMS algorithm obtains a faster convergence rates than MPNLMS algorithm in dispersive circumstances,and has the same performance with their con-ventional counterparts for situation of sparse channel.