this study aims at determining the effect of drip lateral spaces and the full and deficit irrigation on corn yield, The water use efficiency under new land conditions during summer season of 2016 was evaluated. The experiment was conducted in privet farm (green revolution Km31Egypt-Alexandria road after the intelligent village). The farm has the latitude of 30°04'37.0N the longitude of 30°59'53.5E. Single hybrid (Giza /131) corn was used in this study. Irrigation treatments consisted of three different lateral spacing as (A: 0.60m, B: 1.20 m, and C: 1.80 m) and two water level (I1=100%, I2=70%) of water requirements.The study reveal that: The highest seasonal water use was determined in the full irrigation ( I1 100% ), level (607 mm/season) , and the lowest water use was found in the deficit irrigation (CI2 70 %), level (428 mm/ season). The hig.A.S.S1hest grain yield was obtained under ( BI1100% ) treatment with (4912 kg / Fe), and the lowest yield was found in the plant row (1.80 m) away from the drip lateral in (C I270%) treatment with (2504 kg /Fe. Yield from the 1.20 m) spacing with full irrigation treatment BI1100% was significantly higher than in the other two spacing as (A=60cm, C=180cm). According to the research results, preferable lateral spacing for corn plant was found to be 1.20 m. The highest water use efficiency (WUE) was found in BI170% (1.89 kg / m3) and the lowest one was found in the plant row 90 cm away from the drip lateral in CI2 70% (1.39 kg / m3). Thus a lateral spacing of 120 cm (one drip lateral per two crop rows), flow rate 8 L/h/m, (dripper flow rat 4l/h. dripper spaced 0.50 m) was recommended for drip-irrigated corn under the Egyptian climatic conditions.