为了诊断研究ENSO现象,海洋学家和气象学家提出了许多不同类型的指数。对各种不同类型的指数进行分析比较是非常重要的。本文选取4个指数(ENI、RI、SSTI和TDI)用最大熵法(MEM)和自相关函数的傅里叶变换法(FTA)分别计算了它们的功率谱和两指数相互间的协谱、正交谱和凝聚谱,对它们进行了比较。结果表明,4个指数序列变化 To diagnose the ENSO phenomenon, many different types of indices have been proposed by oceanographers and meteorologists. It is important to analyze and compare different types of indices. In this paper, we choose the four indices (ENI, RI, SSTI and TDI) to calculate the correlation between their power spectrum and the two indices by using the Maximum Entropy Method (MEM) and the Fourier Transform (FTA) Orthogonal spectrum and condensed spectrum, they were compared. The results showed that four index sequences changed