Based on climatic ocservational data and radiation information from 1961 to 2003,the interannual trends of cloud cover,sunshine percentage,relative humidity,temperature,precipitation and solar radiation at the earth surface are all investigated.The results show:1)the total cloud cover has decreased and the low cloud increased in most of the ten cities in recent 43 years;2)the sunshine percentage has reduced greatly,the relative humidity decreased except Urumqi,the temperature increased significantly,and the amount of rainfall changed slightly and regionally;3)the total solar radiation at the earth surface has decreased remarkably except Kunming,which was mainly caused by the reducing of direct solar radiation.These results suggest that cities in our country have experienced warming and drying processes,and human activities,especially industrialization and urbanization,have important influence on the climatic system.