Night warming during different growth stages of winter wheat plants increased grain yield by improving photosynthesis and dry matter accumulation. The best results were seen when night warming occurred from jointing to booting stage. This treatment boosted the amount of dry matter in plants and increased grain weight. Night warming also enhanced photosynthesis in leaves and improved stomatal function, leading to better grain production. Overall, night warming at various growth stages improved the productivity of winter wheat plants by increasing photosynthesis and promoting the accumulation of dry matter, ultimately resulting in higher grain yield.