Abstract: 【Objective】 To study the effects of sowing date and density on the photosynthetic characteristics and yield components of winter wheat under drip irrigation in southern Xinjiang and determine the suitable sowing time and planting density in the hope of providing basis for production practice. 【Methods】 Xindong 22 (less-spike type) and Handan 5316 (multi-spike type) were taken as the test materials, the field test design of the split area was adopted, and the main area was three sowing dates: September 23 (B₁) and October 4 (B₂) and October 15 (B₃); the sub-area had four seeding rates: 3.15×10⁶ grains/hm²(M₁), 5.1×10⁶ grains/hm²(M₂), 7.05×10⁶ grains/hm²(M₃) and 9×10⁶ grains/hm²(M₄). 【Results】 Drip irrigation winter wheat flag leaf Pn and Tr were the largest in the flowering period, Xindong 22 had the highest average Pn in the B₂ sowing period and Handan 5316 in the M₃ sowing period. The Pn of B₂M₂ treatment was the highest, Xindong 22 and Handan 5316 reached 15.45 and 16.94 μmol CO₂/(m²·s) respectively; Tr treated with M₂ was the largest and treated with M₄ was the smallest, the follow-up period was delayed. Tr was slowly rising and the trend was the highest with B₂M₂ (Xindong 22) or B₂M₁ (Handan 5316), 6.35 and 6.08 μmol CO₂/(m²·s), respectively; the flag leaf SPAD reached the highest during the flowering period, and the average SPAD decreased with the increase of density or the delay of sowing time. B₁M₁ treatment was the largest, followed by B₃M₁ (Xindong 22) and B₂M₁ (Handan 5316); The relationship model of sowing date, sowing amount and yield was established, and the index of group and individual development was put forward under the condition of high yield. 【Conclusion】 Xindong 22 is sown on October 1 with a volume of 315.30 kg/hm², and Handan 5316 is sown on October 2 with a volume of 262.47 kg/hm², with the highest output, reaching 8,271.88 and 9,116.19 kg/hm², respectively; The technical parameters of increasing density by late seeding are put forward.