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The data of daily rainfall from 54 weather stations in 2004, 2005, 2007 are used to analyze the difference and correlativity between automatic and selfrecording observation rainfall. Results indicate that the average daily rain amount observed by dual tippingbucket pluviographs is 012 mm less than those by the automatic observation, with the standard deviation of the difference being 093 mm; the average daily rain amount observed by hydroconetype pluviographs is 039 mm less than the automatic observation, with the standard deviation of the difference being 15 mm. The application of the automatic rain sensors has certain influence on the statistical results of rainy days. The daily rain amount observed by the selfrecording observation is obviously linearly related to that by the automatic observation. The correlation coefficient of daily rainfall measurements by the tipping bucket pluviograph and the automatic rain sensor is 0996 and the correlation coefficient of daily rainfall measurements by hydrocone type pluviograph and the automatic rain sensor is 0994. The selfrecording rainfall also is obviously linearly related to the manual observation.