The samples of soils in 9 output-orchards were collected in autumn 2003 and 2004.The relation- ships among soil nutrient content,rhizosphere microorganisms and activities of soil enzymes,which were re- garded as a parameters to evaluate soil nutrient condition were analyzed to obtain the biological conditions of rhizosphere microorganism in 9 different apple orchards with varied yield.The results indicated that the a- bove parameters were correlated with apple yield.The contents of alkali--N,olsen-P,and total-C in- creased with orchard yield increased.In high-yield-orchard,the populations of rhizosphere microorganisms and the activities of soil enzymes were high.There was a significant positive correlation between apple yield and species and the amount of the soil microorganisms,and that of the apple yield and olsen-P,avail-K, alkali-N and total-C,and the protease and phosphatase as well.