Results of the ex periment rev eal tha t: There is a di stinct yield increase ef fect oncombined appling Co B, Mo Co and Mo B o n soy bean, the amo unt o f yield increa sera ng ed 7. 9- 11. 8% . Th e combined appling B Mo Co increased 21. 7% in compa ri sionw ith that o f co ntrol. There is benefit fo r soy bean g row th and increase fo r yield by applingB, Mo , Co in combinatio n.