Abstract: Soil evaporation plays an important role in calculating water balance and energy balance in farmland. Soil evaporation in radish field in greenhouse was measured by Micro-lysimeter, the variation law of soil evaporation in radish field was studied, and the relationships between soil evaporation and meteorological factors, such as solar radiation, air temperature and relative humidity, were analyzed in this paper. The results showed that soil evaporation tended to decrease with days after radish sowing, accounted for 37.73%－41.71% of water consumption in the whole growth period, and there was a good exponential function relationship between soil evaporation and solar radiation, air temperature as well as relative humidity. Thus it has significant meaning to establish the optimum irrigation schedule of greenhouse radish.