The results of experiment of applying magnetic biology in corn indicated that in treatment of applying magnetic biological fertilizer,the corn plant growth was vigorous and healthy,color of leaves thick green,but yield and income was obviously lower than that of applying chemical fertilizer treatment.Soil nutrients and the number of beneficial microbes in soil was not changed obviously,whereas soil organic matter increased 15.46 percent and 5.43 percent compared with those applied special-purpose fertilizer and the control.Results showed that bio-organic fertilizer could improve soil environment and maintain balance of soil organic matter.