Abstract: Effects of super micro-powder seed coating agent XM-1 on seedling growth, diseases and pests of cotton were studied by means of experiment of field raising seedling with coated cotton seed. Meanwhile its effects were compared with those of two export seed coating agents. The results show that this seed coating not only could regulate seedling growth, enhance seedling qualities and adult seedling rate, but also could prevent diseases and pests of cotton during seedling. The aduct seedling rate and root vigor of coating treatments increased 14.5% and 16.4% compared with uncoated comtrols, respectively. The prevention rate to main diseases and pests during seedling was 82.0%-90.7%. The general effects of this seed coating agent were better than those of two export agents used in this experiment.