Abstract: Studies were carried out on effects of manganese on yield of soybean with seed treatment and leaf spraying. The results showed that application of manganese can increased the number of seeds per plant and the number of legumes per plant in Kennong18 with seed treatment and leaf spraying, the height of plant and 100-seed weight increased with the increase of manganese and then decreased; the height of plant、the number of legumes per plant、100-seed weight and the number of seeds per plant increase with the increase of manganese in Dongnong42 with seed treatment and leaf spraying.