中文摘要：

利用国家气象信息中心气象资料室整编的中国756个基本、基准气象站在1971-2000年间的日照时数和日照百分率年值、月值数据集，研究了全国范围的日照条件，结合1951-2008年间我国云量、水汽要素资料，分析了影响日照的因素．研究结果表明，我国日照时数和日照百分率的分布形势一致，东南少而西北多，从东南向西北递增．在我国东部地区日照时数由南向北逐步递增，西部地区日照条件整体好于东部，符合常规．藏西南狮泉河一带日照条件最优；40°N纬度带附近和藏南地区次之，江南华南、四川盆地以及云贵高原东部地区的日照条件较差；其余地区日照条件居中．日照时数受云量、水汽要素的影响，呈负相关关系．

英文摘要：

The sunshine conditions over China are analyzed, by using the yearly and monthly data sets of sunshine duration and percentage, from 756 principal and reference climatological stations for the period of 1971-2000. With the statistics of cloundiness, the water vapor from 1951 to 2008, the factors affecting the sunshine are also analyzed. The results show that, the distribution of sunshine duration and percentage are consisitent. The values of sunshine duration and percentage in the southeast are small, and large in the northwest, and the values increase from southeast to northwest. The sunshine duration in eastern area of China increases from south to north, and the sunshine conditions in west- ern area are better than in the east, which is consistent with the common sense. For the sunshine conditions, the southwest of Tibet is the best, followed up by the 40 ° N latitude band and south Tibet; South of Yangzi River, South China, the Sichuan basin as well as the area in east of Yunnan-Guizhou Plateau have worse sunshine conditions; the conditions of other regions are just all right. Sunshine duration is influenced by the cloud and water vapor, and it has a negative correlation with them.