Abstract: Based on the meteorological data of total solar radiation,direct radiation,thermal radiation,temperature,evaporation and sunshine hours in Chengdu from 1991 to 2020,the annual,monthly and daily variation characteristics of solar radiation were examined as well as its influences on temperature,evaporation and other climatic factors by using the methods of linear trend and Mann-Kendall test.The results showed that the total solar radiation and direct radiation presented an increasingly growing trend were 29.69 MJ/（m~2·a）and 20.25 MJ/（m~2·a）,respectively.Secondly,abrupt change of total radiation occurred in 2010,after which the average total solar radiation increased by497.22 MJ/m~2compared with the year previous to the mutation.Moreover,the scattering coefficient showed a decreasing trend with 0.06/a.And the total solar radiation was positively significantly correlated with the highest temperature,evaporation and sunshine hours.For every 10 MJ/（m~2·a）increase in total solar radiation,the annual maximum temperature would increase by 0.012 ℃,the annual sunshine duration would increase 1.7 hours and the evaporation amount would increase 1.2mm.In terms of the factors contributing to the increase of solar radiation,the decrease of cloud amount played a major role.