基于最大似然法的交替陷波周期图算法（ＡＮＰＡ）是一种超分辨率的谱估计算法，它同时具有超分辨率、高精度和低信噪比门限的特性。本文提出了一种计算陷波周期图的新算法，它可使运算量和存储容量大幅度下降。计算机仿真结果证明了这种算法在分辨能力和估计精度方面优于己有算法。 The Alternating Notch Periodic Graph (ANPA) algorithm based on the maximum likelihood method is a super-resolution spectral estimation algorithm which has the characteristics of super-resolution, high precision and low SNR threshold. In this paper, a new algorithm for calculating the notch period is proposed, which can greatly reduce the computation and storage capacity. Computer simulation results show that the proposed algorithm outperforms its own in terms of resolution and estimation accuracy.