In order to improve the aerobic fermentation efficiency and composting quality of leaf vegetable waste，the effects of different material ratios on the effect of aerobic composting of leaf vegetable waste were studied and the optimal carbon to nitrogen ratio( C/N)of leaf vegetable waste aerobic composting was determined.Aerobic fermentation was carried out with leaf vegetable waste as the main material and corn straw，corn straw+cow dung as auxiliary materials.The initial C/N was adjusted to 15，20 and 25.The maturity and compost quality of aerobic compost were evaluated by pH，conductivity，organic matter，total nitrogen，total phosphorus，total potassium and seed germination index，and the best C/N of leaf vegetable waste aerobic compost was selected.The results showed that:the seed germination index of B1 treatment(C/N was 20，the bottom material was leaf vegetable waste+corn straw)was 115.30%，and the seed germination index of B2 treatment(C/N was 20，the bottom material was leaf vegetable waste+corn straw+cow dung)was 126.77%.The compost material had the highest maturity degree and the best maturity effect，the highest decomposition rate of organic matter in B1 treatment was 22.71%，the highest content of total nutrients was 6.4%，and the contents of total nitrogen，total phosphorus and total potassium increased by 26.61%，62.17% and 57.23%，respectively.In summary，when the C/N of leaf vegetable waste and corn stover combined aerobic fermentation was 20，the composting effect was the best.Adding an appropriate amount of cow dung to the compost base material can improve the maturity of the pile material.