Based on the monthly observational data of sunshine hours, using Rotated Empirical Orthogonal Function (REOF), linear trend analysis, Mann Kendall mutation test and Morlet wavelet analysis, the climate characteristics and trend of sunshine hours over the Yangtze Huaihe Basin in summer half year (May to October) were statistically analyzed. Results show that sunshine hours over this area in summer half year were 1000 to 1200 h overall, increasing from the south to the north of spatial distribution characteristics. However, regional differences existed for the factors of topography. The standard deviation and average sunshine hours do not present the same distribution. The sunshine hours in Yangtze Huaihe Basin are divided into four areas furthermore, north area respectively Ⅰ, northeast area Ⅱ, southwest area Ⅲ, southeast area Ⅳ, sunshine hours of each area declined significantly, but remarkable differences exist in linear trend, mutation, time and variation period.