Eight cropping systems including wheat-rice,rice-rice,rapeseed-soybean,rapese ed-pea nut,wheat-sesame,wheat-cotton,pepper-cabbage,radish-eggplant were conducted to study manganese cycling and balance in farmland ecosystem of Jiang Han Plain in Hubei province. The results show that the main output of manganese was crop h arvest,which accounted for 81.3%-95.8% of total,while field runoff and soil lea ching of manganese were very little. The main inputs were from organic ferti lizer,rainfall and natural return,while inputs from inorganic fertilizer and see ds (seedlings) were very little. The results show that the manganese balance wer e more positive in two patterns of rice and commercial vegetable ecosystems,and negative in upland field ecosystem without organic fertilizer input.