Abstract: Based on the hour’s data of meteorological stations from 1965-2011, the characteristics of sunshine hours change in Tianshui City had been studied with the methods of accumulative anomalies, Mann-kendall test and wavelet analysis. The result indicated that, the annual average sunshine hours showed a trend of decrease in Tianshui, The annual average sunshine hours increased during 1965-1980 and 1993-2008, and it showed a trend of reduce in, and tends to decrease since 2009. The greatest amplitude season was summer, spring sunshine hours change is on the rise, the rest of the season was on the decline. The wavelet analysis results showed that throughout the year and each season of sunshine hours most had the small scale of quasi cycles in Tianshui, winter there were mesoscale cycles, summer on the interdecadal changes exist quasi cycle changes in 27 years. Spatial distribution of the change rate showed that the trend was general but not universal; the change tendency was more significant in the north of Tianshui.