Based on the data observed at 95meteorological stations of Shaanxi Province from 1961to 2010,Mann-Kendall trend test and EOF analysis were used to study the tendency of the variation characteristicsof seasonal sunshine duration.Results showed that the seasonal sunshine duration decreased in summer andwinter in the last 50years,of which the decreased trend in summer passes significance test at p=0.01confidence level.The seasonal sunshine duration showed increased trends in spring and autumn,but the trendswere not significant in spring and autumn.The anomalous centers of the seasonal sunshine duration weremainly in the central Yan'an City and the west of Baoji City,and they were different in different seasons.