本文分析了基于四阶累量的ＭＵＳＩＣ算法（记作ＦＯＣ－ＭＵＳＩＣ），在实际阵元存在幅相误差时，对波达方向（ＤＯＡ）的估计性能，给出了大样本情况下的估计方差公式，并与基于协方差矩阵的标准ＭＵＳＩＣ算法作了比较。计算机仿真结果表明，本文给出的方差公式与实验仿真结果十分接近。文中还给出了利用高阶累量的方法可获得阵列有效孔径扩展的新解释。 This paper analyzes the MUSIC algorithm based on the fourth-order cumulant (denoted as FOC-MUSIC). When the amplitude and phase error of the actual array element exists, the estimated performance of the DOA in the DOA is given. Formula, and compared with the standard MUSIC algorithm based on the covariance matrix. Computer simulation results show that the variance formula given in this paper is very close to the experimental simulation results. In this paper, we also give a new explanation of the effective aperture expansion of the array by using the high order cumulant method.