This paper was about studies of microbial distribution in different air environmental sites in Shenyang. The results shown that there were more bacteria in urban district than in suburbs and more bacteria were in busysections and traffic cross-roads than in school、factories and residential areas.More molds existed in suburbs than in urban districts. However there were no difference about the distribution of adinomyces in urbans and suburbs.The air in suburbs were clean but in urban districts especially in b...