年日照百分率呈双波型变化。
本文根据日照百分率年变程曲线类型，应用聚类分析方法，把全国划分为12个日照区。
By using the method of cluster analysis, the annual variation curve types of the sunshine percentage in China are divided into 12 divisions.
主要研究结论如下：（1）1951-2008年，年和生长季的日照时数及日照百分率均呈减少趋势。
The main research achievements are as follows:There was a decreasing trend of the sunshine duration and sunshine percentage of year and growing season from 1951 to 2008.
根据日照百分率日变程曲线的变化规律，对于日照百分率大于70%的地区，建议了一种新的日照百分率计算式。
According to the daily change law from curves for percentage insolation, this paper presents a new formula of the average insolation in the zones where the insolation is more than 70%.
根据日照百分率日变程曲线的变化规律，对于日照百分率大于70%的地区，建议了一种新的日照百分率计算式。
According to the daily change law from curves for percentage insolation, this paper presents a new formula of the average insolation in the zones where the insolation is more than 70%.
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