A field experiment on Summer Corn in Beijing was conducted to investigate the effects of drip irrigation frequency on soil moisture,heat and maize growth.The results show that,the soil moisture remains relatively stable at the whole growth period under high-frequency irrigation.Soil temperature is significantly affected by soil moisture distribution,air temperature and the stage of crop growth,and the air temperature plays a primary role to soil temperature at 10cm deep.Soil temperature tends to be stable at the depth of 50cm and below,however,it also rise gradually with the increasing air temperature.Although the high-frequency irrigation is accompanied with high yield,this treatment has lower water use efficiency yet.Thus,intermediate-frequency irrigation is more advised for the summer corn of North China with the comprehensive consideration of economic efficiency and water use efficiency.