Abstract: Soil evaporation is useless because it doesn't participate in the processes of physiology and production of crops. The soil evaporation in different row spaces of winter wheat was measured by the Micro-lysimeters (MLS). The results show that with the increase of row spaces, the soil evaporation is inc reased, narrow row space can reduce the soil evaporation due to the bigger plant canopy. The whole soil evaporations of winter wheat are 89.1mm, 104.2mm and 1 21.9mm under the row spaces of 7.5cm，15.0cm and 30.0cm. If taking the soil evaporation of 15cm row space as CK, the soil evaporation with a row space of 7.5cm reduces 14.5%, and that with a row space of 30cm increases 17.0%.