Abstract: A new natural high molecular material, including chitosan and fulvic acid, was used to improve the film-forming ratio and active ingredient release rate of seed coating in the present study. Degree of uniformity, falling off rate, germination rate and film forming ability of seed coating, which used new natural high molecular material, were tested by classic normal methods. The results showed that 1.0% chitosan and 3.0% fulvic acid was the best dosage of the new film-forming agent in this research. The physical-chemical indexes of new high molecular agent were better than that of one single composition film-forming agent. Besides, the new high molecular agent had more stability application performance because the compounding high molecular film-forming agent had a synergistic effect.