本文介绍了对拖线阵海试数据进行窄带ＰＩＣ处理的方法。用梯度算法、协方差矩阵递归直接求逆算法和ＲＭＧＳＥＦ算法进行了窄带ＰＩＣ自适应处理。分析了学习曲线和输出平均功率波束图，进行了稳态计算和比较。表明ＲＭＧＳＥＦ算法是一种可用于多干扰波束、收敛快、抵消性能好、便于拖线阵声呐实现实时ＰＩＣ处理的最好算法。 This article describes a method for narrowband PIC processing of towline array sea trial data. The narrowband PIC adaptive processing is carried out with gradient algorithm, covariance matrix recursive direct inversion algorithm and RMGSEF algorithm. Analysis of the learning curve and output average power beam pattern, steady-state calculations and comparison. It shows that the RMGSEF algorithm is a best algorithm that can be used in multi-interference beams, converges fast, and has good performance of offset and facilitates the real-time PIC processing of the towed line array sonar.