Abstract: 【Objective】 To study the effects of different phosphorus fertilizer application methods on the photosynthesis characteristics, chlorophyll fluorescence and yield of dry-seeded wet-irrigated winter wheat, and to provide theoretical basis for phosphorus fertilizer application methods in dry-seeded wet-irrigated mode under drip irrigation. 【Methods】 Under field test conditions, Xindong 22 was used as experimental material, and a two-factor split plot experiment design was adopted. Two kinds of seedling emergence water methods were set up in the main plot: sowing (F) and dry sowing (D). Under the condition of the same total phosphorus application amount, three phosphorus application methods were set up in the secondary district, 100% base application (P₁), 70% base application +30% drop application (P₂), 50% base application +50% drop application (P₃), and the effects of different phosphorus application methods on photosynthetic characteristics, chlorophyll fluorescence and yield of wet wheat were analyzed. 【Results】 Phosphorus fertilizer postpone significantly increased leaf SPAD value and LAI of wheat by 0.88%-7.63% and 7.25%-49.38%, respectively. In the photosynthetic characteristics of wheat, all indexes showed a downward trend with the growth period, among which DP₃ treatment showed the best performance, Pn, Tr and Gs were 25.59μmol/ (m²·s), 18.21 mmol/ (m²·s) and 0.73 mmol/ (m²·s) at flowering stage, respectively. The lowest Ci was 324.88μmol/mol, and the difference between treatments was significant. The number of panes, grains per spike and 1000-grain weight were increased by 1.36%-18.43%、0.59%-4.06% and 0.77%-7.21%, respectively, compared with FP₁ treatment. The grain yield was DP₃>DP₂>FP₃>FP₂>DP₁>FP₁. Compared with FP₁, the yield increase of each treatment was more than 4.5%. 【Conclusion】 DP₃ treatment (50% base application +50% topdressing) can promote photosynthesis of winter wheat under the experimental conditions, and the yield and yield components have the best performance.