Abstract: Effects of sowing date, planting density and nitrogen application regime on grain yield and compositions in winter wheat .It was shown that all three factors contributed significantly to yield but depend-on the cultivars of wheat. The most suitable sowing period was from 10/15 to 10/22 and planting density was from 120×104plants/hm2 to 240×104 plants/hm2. Meanwhile, the first suitable nitrogen application technique was 210kg/hm2(basal N fertilizer: jointing stage N fertilizer: booting stage N fertilizer =3:5:2) and the second suitable nitrogen application technique was210kg/hm2(basal N fertilizer :jointing stage N fertilizer =5:5).To make the winter wheat have a high yield above 9000 kg/hm2, stem and tiller were indicated equal important, and suitable yield components proportion was 4:4:4, viz. the panicle number was from 39.4×104 to 44.3×104 plants per 666.7m2, the grains number per ear was from 35.3 to 40.0 and the 1000grains weight was from 40.2 to 45.8g.