Abstract: This paper introduces the increasing productivity mechahism of paraffin inhibition,wax removal and decreasing oil viscosity technique by microorganism. Based on the analyses of field testing results of 10 wells in Jidong oil field,this paper comes to the conclusion that this technique has good paraffin inhibition and removal effect,which the oil viscosity decreased by 70%,and has obvious effectiveness of increasing production,which indicatesthat good benefit will be obtained.