A field summer corn experiment of different irrigation quantity was conducted under drip irrigation in Beijing. Soil water content and summer crop yield were observed for study the effects of different irrigation quantity on soil water distribution and water use efficiency. The research results showed that the difference of the soil water distribution were smaller in the same layer since the 2012 was a wet year. The total water consumption decreased with the irrigation water decreased. But it can meet the needs of summer corn water requirement in a wet year. Soil water content kept balance between water storage and water supply in the summer corn growth. The water use efficiency of each treatment increased with irrigation water quantity decreased. Irrigation method with 30%（ET0-P）can obtain higher water use efficiency. Irrigation method with 30%（ET0-P）of drip irrigation, which water consumption was 368.5 mm and irrigation water amount only was 42.9 mm, is recommended as a result of increasing water use efficiency and the summer corn yield decreasing slightly in researching area.