Abstract: The paper sets forths the effectiveness of soybean seed coating powder on output character of soybean and results of controlling root rot .The result states clearly that the seed coating powder is safe and effective .It can raise remarkably and more remarkably growth state of soybean in its early days ,and can prevent and cure effectively soybean root rot in its earlier stages ,and protection effectiveness comes up to 83.9 percent, and it improves remarkably yield properties, soybean yield is raised remarkably, increase output reaches10.2percent.