Changes of soil microbial communities in different rhizosphere soil of solar greenhouse in Lvyuan,Kuancheng,Chaoyang,Jingyue,Erdao districts of Changchun city for 20 years was investigated in this study.The population of bacteria,fungi and actinomycetes at Lvyuan,Kuancheng and Jingyue district increased gradually from 10 to 15 years after cultivation and then decreased as time increased.As well as,fungi population at Chaoyang and Erdao district decreased until middle of the cultivation periods and then increased.While,the population of actinomycete decreased gradually with time.The highest populations of bacteria,actinomycete and fungi were found in Kuancheng district,Kuancheng and Chaoyang individually.However,the lowest populations of bacteria,actinomycete and fungi were found at Lvyuan district.Average populations of microbial communities were found at left areas.At all area,the obvious decrement in the populations of bacteria and actinomycete were found with depth.However,there was no clear decrement was found in fungi population