Abstract: Organic fertilizer, compound fertilizer and now biological modifier, EM （TM） were used modified alkaline soil in Tumochuan plain. Throuth applacation of modifor EM, soil salt descend range was 23.21% to 48.43%, pH decline range was 3.88% to 10.63%,and soil basicity reduced range between 3.02% and 4.06% ,but nutrients in the soil were increased. Available phosphorus and available potassium and organic matter,soil microbial biomass carbon respectively increased more than CK by 43.41%, 32.37%, 39.75%, 55.68%. The results showed that the biological modifier - EM improved effect.