The resulte of the trial of inoculation with both VA-mycorrhizal fungus (glomus sp.) and Rhizobia for sweet-clover showed that when the phosphate was applied alone, the infected frequence of VA-mycorrhiza was increased 65%, and the activity of nitrogenase was increased 2.9 times as compared with contral without inoculated.At addition, dry-matter of clover plant was increaced 90.5% also.But in both nitrigen and phosphorus fertilizer were applied did not gave a beneficial result to inoculated plant.