The effects of silicon fertilizer application on absorption and utilization of nitrogen,phosphorus and potassium and yield of maize under chemical fertilizer reduction were studied.A split plot design was applied in this experiment,three combinations of nitrogen,phosphorus and potassium fertilizer(F100conventional fertilizer application rate,F80decrement 20%and F60decrement 40%,respectively)were set up in the main plot;and two silicon fertilizer rates(rate of silicon fertilizer was 375 kg/hm2 and 75 kg/hm2,named S3 and S7,respectively)was set up at the subplot.Dry matter accumulation,nitrogen,phosphorus and potassium accumulation of jointing stage and maturity stage,grain yield and yield components were measured.Compared with the treatment of F100,the accumulation of dry matter,nitrogen,phosphorus and potassium decreased significantly at jointing stage and maturity stage,the ratio of dry matter,nitrogen,potassium and silicon in grain decreased significantly at the mature stage,the grain number per panicle,grain number per row and panicle length decreased significantly,the length of bald tip increased by 20.96%and 25.33%,and the grain yield decreased by 10.77%and 17.77%under the treatment of F80 and F60.In F100，F80 treatments,dry matter accumulation,nitrogen,phosphorus,potassium and silicon accumulation at jointing stage and maturity stage,P dry matter production efficiency,P grain productivity and P fertilizer partial factor productivity and grain yield were all improved by applying 75 kg/hm2 silicon fertilizer compared with appling 37.5 kg/hm2.At maturity stage,by applying 75 kg/hm2 silicon fertilizer,the distribution ratio of nitrogen and potassium in grain were increased and the distribution ratio of nitrogen and potassium in stem were decreased under the treatment of F100,the distribution ratio of phosphorus and silicon in stem were increased and the distribution ratio of phosphorus in grain was decreased under the treatment of F80;the distribution ratio of silicon in stem and grain were decreased under the treatment of F60.Under the treatment of F80 and F100,fertilizer partial factor productivity of nitrogen,phosphorus and potassium fertilizer were all improved obviously by applying 75 kg/hm2 silicon fertilizer.The accumulation of nitrogen,phosphorus and potassium at the key growth stages,the dry matter accumulation and grain yield decreased with the reduction of nitrogen,phosphorus and potassium fertilizer.Under the normal application rates of nitrogen,phosphorus and potassium fertilizer or reduction proportion of them less than 20%,the absorption of nitrogen,phosphorus and potassium were promoted,the dry matter accumulation was increased,and the utilization efficiency of nitrogen,phosphorus and potassium fertilizer and grain yield were increased by applying 75 kg/hm2 silicon fertilizer.