Abstract: To improve the seedling quality, germination rate and speed of 4 herbage species, Medicago sativa, Vicia villosa var. glabrescens, Trifolium repens and Lolium multiflorum, home-made 2% tebuconazole biological complex seed-coating agent (BCSA), 39% metalaxyl-M azoxystrobin, 600 g/L imidacloprid, and 35% thiamethoxam were used with best doses for seed coating. The results showed that compared with naked seed control (NSC), the coated seeds with 39% metalaxyl-M azoxystrobin, 600 g/L imidacloprid, and 35% thiamethoxam, the germination rate of BCSA coated seeds of M. sativa increased by 9.55%, 9.09%, 39.68% and 6.45%, the germination rate of BCSA coated seeds of Vicia villosa var. glabrescens increased by 66.66%, 30.18%, 43.78% and 7.32%, and the germination rate of BCSA coated seeds of T. repens increased by 31.25%, 12.51%, and 17.75%, 12.51%, respectively, but the germination rate of L. perenne seeds had no change. Compared with the NSC, BSCA had significant effect of growth promotion. Root length of M. sativa, V. villosa var. glabrescens, T. repens and L. multiflorum increased by 30.29%, 17.12%, 33.80% and 7.36%, seedling length increased by 15.86%, 10.26%, 18.08% and 5.31%, and the above-ground fresh weight increased by 15.66%, 42.49%, 97.26% and 15.88%, respectively. So BCSA can promote seed germination and plant growth of M. sativa, V. villosa var. glabrescens, T. repens, and L. multiflorum can promote seed germination and plant growth.