To find out effects of manganese fertilizer on growth, output and quality of potatoes, potato seeds were dipped in MnSO4 solution for some time. The result indicated that the appropriate dosage of manganese fertilizer could promote the growth, strengthen the ability of resisting adversity, heighten and output and quality of potatoes. However, too much use of manganese fertilizer could have negative effects.The appropriate content of MnSO4 solution is 0.01~0.1%。