Abstract: HaMi Dananhu coal was oxido decomposed by nitric acid and high yield nitric fulvic acid was obtained. It shows that this nitric fulvic acid has a good stimulation on plant growth by physiological acitive experiments. The content of acid radical group and carboxyl group increase with the increase of the E 4/E 6 value. The nitric fulvic acid is of great value on plant growth on account of its active groups increase.