On the basis of comparing and analyzing the monthly mean temperature and sunshine hours in Guangzhou, Jinan and Kunming, the article points out that how to utilize the solar energy in the hottest month to improve the indoor environ-ment and reduce the energy consumption of the air conditioner shall be viewed as an important research subject and explored.

There are some traditional methods to calculate sunshine hours,but they all take lots of time and energy,especially in the mountainous areas of complex terrain.

According to the sunshine design principle,it applies stick sunlight shadow chart,and analyzing tool to reveal the relation between sunshine hours,sunshine quality and sunshine distance,puts forward the new method to make sunshine distance,which satisfies the sunshine standard.

Based on the monthly sunshine hours,the ≥0.

According to the annual and seasonal sunshine hour data of the 60 weather stations of Henan province from 1965 to 2006,this paper analyzes the temporal and spatial variety of the sunshine hour,and carries on t test to the climate abrupt change.

The change of sunshine hours affects the growth of plant, animal and the anthropogenic activity.

Climatic change of sunshine duration and its influencing factors over Heihe River Basin during the last 46 years

The open system is not suitable for adoption in solar photovoltaic engineering because of its inefficiency through analyzing the national sunshine duration table.

Based on the analysis of variation of sunshine duration in Dongyang,Zhejiang-province,from 1957 to 2006,it shows that the sunshine duration in Dongyang overall assumes the declining trend,and the tendency to be more obvious from the 1990s.

On the basis of the monthly sunshine duration data for the period 1961～2007 collected from 68 meteorological observation stations over Tibetan Plateau(TP) and by the methods of statistics analysis,the characteristics of interdecadal variation of the annual sunshine duration over TP were analyzed.