Through a series of tests, we have examined the influence oflunar-terrestrial relation on precipitation during the rainy seasonover East China.The information used includes: the degree ofdrought or flood estimated from historical events in East China inthe past 500 years, the inferred indices of Meiyu and SummerDrought over the middle-lower Yangtze Valley for the past 100years, and the precipitation amounts and frequencies of rainstormsduring the rainy season over Jiangsu Province for the recent 30years. No significant statistical relationship between these data andthe lunar-terrestrial relation has been found. Systematic high corre-lations are also lacking between the Northern Hemisphere Summercirculation on the mean monthly 500mb charts and the lunar phases.Thus, we can conclude that lunar-terrestrial relation-though itstidal force might have some influence on the long-term fluctuationof certain climatic elements-has too small an effect to be considered in long-range forecasting.