Abstract: Studies on the hydrothermal regime of three soils with different texture in East Henan Plain and the characteristics of grain formation of winter wheat show that during grainfilling stage of wheat, the average daily temperature at 0～5cm layer of clay loam, loam and sandy loam soils is respectively 18.3, 19.1 and 19.5℃. Their moisture content is in the order of clay loam>loam>sandy loam. The duration of grain-filling stage,thousandgrain weight and grain yield are respectively 38 days,45.5 g and 8253 kg·hm^-2 on clay loam soil;33 days,42.4g and 7617 kg·hm^-2 on sandy loam soill and 36 days,43.1 gand 7980 kg·hm^-2on loam soil.

Key words: Soil texture, Hydrothermal regime, Winter wheat, land use change, soil water conservation, soil water holding capacity, Hainan Island