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Based on the monthly runoff and meteorological data during 1959-2009 of the Dongjiang River basin, the space-time change of meteorological elements and variation tendency of the runoff were analyzed by using the Mann-Kendall trend test, correlation analysis and relevancy analysis methods. The correlation and relevancy between them were also found out. The results showed that: 1) The precipitation and temperature decrease in summer and fall, while evaporation showed a significant reduction indoi:10.4236/jwrr.2012.14032 fatcat:rwfqcnyw2rhdvflniihwi7rhli