The effects of long-term fertilization on soil microorganism populations and their quantity and the correlation between microorganism and available nutrients basis in cinnamon soil were studied in this paper.The results showed that bacterial was the main microorganism in cinnamon soil with the proportion of 92.72%~95.91%.Organic fertilizer could significantly increase the quantity of soil microorganism for bacteria quantity of M1N,actinomycetes quantity of M1NP,fungi quantity of M2NP were the highest of all treatments and the bacteria quantity difference of M1N compared with the control was significant.The quantity of phosphate-solubilizing bacteria also could be significantly increased under the conditions of using organic fertilizer.The correlations between bacteria,fungi,actinomycetes and inorganic phosphate-solubilizing bacteria with available nitrogen,available phosphorus and available potassium were in significant level.