Abstract: This paper introduces the mathods processing towed-line array sea trial data with narrowband PIC, the gradient algorithm, direct inversion of the sample covariance matrix recursive algorithm and RMGSEF algorithm, analyzes the learning curves and the output mean power beam pattens, compares these algorithm with the steady state calculation results. It is shown that the Performance of RMGSEF algorithm is optimal at cancel and convergence, it is suitable for multiple interference beams and can make the towed-line array sonar to achieve real time processing.