Silage maize is currently one of the important forms in the maize production.Organic fertilizer Substitution(OFS)is one of the important ways in enhancing production benefits of silage maize.The purpose of this study is，by the field experiment，to provide experimental basis for OFS in the silage maize production.There were 4 treatments in the experiment:(1)100% chemical fertilizer N，(2)70% chemical fertilizer N+30% organic fertilizer N，(3)40% chemical fertilizer N+60% organic fertilizer N，and(4)100% organic fertilizer N.During the growth season，plant growth parameters(plant height，SPAD，leaf area index，dry mass accumulation)，and yield and quality of silage maize at harvest were measured.The results showed that:(1)For plant growth，organic fertilizer substituting chemical fertilizer had no impact on plant height and SPAD value，but significantly affected leaf area index，N content in stems and leaves，and dry mass yield；(2)For quality of silage maize，organic fertilizer substituting chemical fertilizer improved the crude protein content in the whole plant and leaves，reduced the neutral detergent fiber and acid detergent fiber content，and improved the integral quality of the silage maize.In summary，the 30% OFS is the best way in this study.