Organic FertilizerSubstitute(OFS)is one of the important ways in the production of sweetcorn.It is significantto clarify the effects of OFS on soil nutrient supply and yield and quality of sweetcorn.The purpose of this study is，byfieldexperiment，to provide experimental basis for OFS in the sweet cornproduction.Four treatments weredesigned，(1)100% chemical fertilizerN(codeN10)，(2)70% chemical fertilizer N + 30% organic fertilizerN(codeN7)，(3)40% chemical fertilizer N + 60% organic fertilizerN(codeN4)，and(4)100% organic fertilizerN(codeN0).Duringthe growth season，soil nutrients in the surfacelayer(soil mineralN，available P andK，soil microbial biomass C and)and plant growth parameters(plantheight，SPAD，dry mass accumulation)were measuredtwice.At harvest，yieldand quality of sweet corn and indicators as silage of leaves and stems weremeasured.The effects of OFS on soil N.nutrientsupply，yield and quality of sweetcorn，and silage indicators of fresh biomass were discussed.The results showedthat，(1)at flared stage，60%～100% OFS significantly reduced the supply level of mineralN，but increased soil microbialbiomass C and N level in the surfacelayer，and significantly increased the N content of the flag leaves；(2)at harvest，60%～ 100% OFS significantly increased soil microbial biomass C and C/N ration in the surfacelayer，the SPAD values andN content of the flagleaves，and N content of the wholeplant；(3)OFS had some impact on yield of sweetcorn，but noimpact on quality of sweetcorn；(4)60% OFS improved the crude protein content in the wholeplant.The harvested leavesand stems could be used assilage.For the short growing season and intensive requirement of soil nutrient of sweetcorn，theimpact of OFS on the soil N supply process needs more attention tostudy.