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 x 104 kernel/hm2 to October 1,570 x 104 kernel/ 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 x 10 kernel/hm , 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 determined to ensure the coordination of yield and quality of wheat.%通过田间试验和室内品质分析,研究了播期和密度对冬小麦天选45号产量和品质的影响.结果表,明:随着播期的推迟,小麦的产量降低,通过增加密度可以提高小麦成穗数,达到提高产量的目的.从播期与密度互作对产量影响来看,适宜播种期为9月25日至10月1日,播量随播期的推迟而增加,基本苗由9月25日的390万/hm2增加到10月1日的570万/hm2.但随播期的推迟,粗蛋白含量和沉降值呈降低趋势,湿面筋含量、面团形成时间和面团稳定时间呈上升趋势；当密度为390万/hm2时,蛋白质含量、湿面筋含量最大,分别为14.24％和31.72％.因此,可根据需要,确定最适的播期和种植密度,使产量和品质协调统一.
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