The experimental results of three years in different locations demonstrated that deep spreading of diammonium phosphate could bring about increase of plant height,stem thickness,node nomber,pod nomber,seed nomber and dry matter weight in soybeans.The soybean yields of the fertilizer spreaded under the seeds 10 cm,5 cm and 1 cm depth in creased 22.5%,23.7% and 8.1% respectirely compared with the yield of spreading fertilizer together with seeds.The authors suggested that diammonium phosphate should be spreaded under feeds,5 to 10 cm depth in field production.