本文提出了一种低复杂度的变遗忘因子机制用于递归最小二乘恒模约束算法中来抑制干扰。改进的方法通过恒模代价函数的时间平均来调节遗忘因子，从而更快地跟踪干扰并抑制，该文章计算量低，收敛速度快。-This paper presents a low complexity variable forgetting factor recursive mechanism for lscm constraint method to suppress interference. Improved methods be regulated by the CMA average cost function of time forgetting factor, leading to faster track interference and suppression, lower this article calculation, fast convergence.