| The effects of sowing date and planting density on yield and quality of winter wheat variety Tianxuan 45 were studied through field tests and quality analysis. The results showed that wheat yield were decreased along with the delay of sowing date，spikes of wheat were raised through increasing planting density to improve wheat yield. From the interaction of sowing date and density，the appropriate sowing date was from September 25 to October 1, seeding rate was increased along with the delay of sowing date from september 25, 390×104 kermel/ hm2 to October 1, 570×104 kemel/hm2. Protein content and sedimentation value were decreased, wet gluten content， dough development and sable time were increased along with the delay of sowing date. When the planting density was 390×104 kernel/ hm2，protein content and wet gluten content were the maximum value, which were 14.24% and 31.72% respectively. According the need, the proper sowing date and planting density would be detemined to ensure the coordination of yield and quality of wheat. |