中文摘要：

淮河流域40个县（市）区水稻日照适宜度、降水适宜度与气候适宜度均呈下降趋势。分析淮河流域水稻温度、降水、日照和气候适宜度的区域差异，将淮河流域分为最适宜区、适宜性区、次适宜区。综合降水、日照、温度三因素，将淮河流域水稻气候适宜度分为分成淮北最适宜区、淮南最适宜区、淮河沿岸适宜区和西部山地次适宜区，分析各区水稻适宜度年际变化规律，结果表明：各区的水稻气候适宜度均呈逐渐下降趋势。

英文摘要：

The interannual change of the sunshine suitability, the precipitation suitability and the climate suitability of rice in 40 counties of Huaihe Watershed are decreasing every year. The article analyzes the difference of the sunshine suitability, the precipitation suitability and the temperature suitability of rice in Huaihe Watershed, then divides Huaihe Watershed into three sub-regions： the highest suitability region, the suitability region, the low suitability region. Synthesizing the factors of temperature, sunshine and precipitation, the four types of climatic suitability of rice in Huaihe Watershed are divided： the north watershed highest suitability region, the southwatershed highest suitability region, the central watershed suitability region, the northwest mountainous area low suitability region. Then the article analyses the interannual climate suitability change of rice at these regions. The result shows that the climate suitabilities of rice at these regions are decreasing gradually.