Based on observed data of 14 meteorological stations and six main hydrological stations in lake Poyangbasin, the trends and jumps of temperature, precipitation, pan evaporation(PE), reference evapotranapiration(ETr) and discharge are analyzed from 1961 to 2003. The results indicate that the temperature jumped in 1990, then it dominated an upward trend ever since 1990. Significant positive trend was noticed after 1986 in winter. Asto precipitation, it changed abruptly in 1990. In 1992, the heavier rainstorm resulted in more precipitation in sum-mer. Significant negative trend of PE and ETr was found, especially in summer. It was found that summer ETr fellsharply after 1992. As for spatial distribution, significant climate change areas are found in the Raohe River basin,the Xinjiang River basin and the lower reaches of the Ganjiang River basin. The climate change trends above-men-tioned,that is coincident with the trend of the Yangtze River basin, are more obvious in 1990s. As a result, therunoff to the Lake Poyang also rose up. In 1990s, warm and humid climate tendency was strengthened. The climatechange of lake Poyang basin is much significant in the Yangtze River basin.