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本文采用经验正交函数（EOF）展开和波谱分析方法，讨论1953年1月至1977年12月北太平洋500hPa高度场分布特征及其演变周期，并讨论它们分别与赤道东太平洋海温、南方涛动指数关系。计算结果表明，北太平洋500hPa高度场的年际变化异常型主要为高度场大范围偏高（偏低），此异常型具有60个月（5年）、40个月（约3．3年）和20个月（约1．7年）显著周期，且在60个月、40个月周期上同赤道东太平洋海温、南方涛动指数有显著关联；其次为该高度场北部偏低（偏高）、南部偏高（偏低）的异常型，其显著周期为30个月（2．5年）、24个月（2．年）及15个月（约1．3年），且在两年周期上同赤道东太平洋海温、南方涛动指数有显著关联。
In this paper, we use the empirical orthogonal function (EOF) expansion and spectral analysis methods to discuss the distribution characteristics of the 500hPa geopotential height field in the North Pacific from January 1953 to December 1977 and their evolutional cycles. We discuss their correlation with the SST anomalies in the eastern equatorial Pacific Ocean, Dynamic index relationship. The calculated results show that the anomalous pattern of 500 hPa geopotential height anomalies in the North Pacific Ocean is mainly high (low) over a wide range of the height field. The anomaly pattern has 60 months (5 years), 40 months (about 3.3 years) And 20 months (about 1.7 years), respectively, and significantly correlated with the SST and Southem Oscillation index over the eastern part of the equatorial Pacific over the 60-month and 40-month periods. The second is the northern low High) and high (low) anomalies in the south with significant periods of 30 months (2.5 years), 24 months (2. years) and 15 months (1.3 years) In the two-year cycle, there is a significant correlation with the SST in the eastern equatorial Pacific Ocean and the Southern Oscillation Index.