Based on the data of sunshine hours,relative sunshine,total cloudiness and lowe r cloudiness from 1961 to 2000 in Wuxi observation station,the variation charact eristics of sunshine hours in recent years in Wuxi region are analyzed.The month ly and yearly variation of sunshine hours,the relation between sunshin e hours and relative sunshine,total cloudiness,lower cloudiness are studied.The results show:sunshine hours has greatly decreased in the recent 40 years,with th e breadth of 99.72 h/10 a and decreased fastest in summer and autumn;the monthl y variation of sunshine hours is bigger in summer and autumn than that in winter and spring;the monthly variation tendency of sunshine hours and relative sunshi ne is different;there exits negative relevance relation between sunshine hours a nd total cloudiness and lower cloudiness;the sudden change of sunshine hours occ urred in 1987,and then there is a relative less hours period.