In order to explore the influences of different water treatments on evapo-transpiration and the growth of common green hedge tree Ligustrum quihoui Carr in the cities of North China,small plot and pot experiments were carried out in the Shingle economic area of Horinger County and Hohhot City.Pot experiment had nine water treatments and small plot experiment,four drip irrigation treatments.Results show that more the irrigation amount is,the greater the evapo-transpiration will be.The maximum evapo-transpiration occurs between 75%and 100%field capacity（FC）and the minimum evapo-transpiration,between 35%and 45%FC.The relationship among plant height,crown diameter and evapo-transpiration may be described by a downward quadratic parabola.The maximum evapo-transpiration occurs between 65%and 100% FC and evapotranspiration under different water treatments is positively correlated with aboveground biomass.The water use efficiency（WUE）of Ligustrum quihoui Carr tends to decease with increasing evapo-transpiration.The maximum evapo-transpiration occurs at 35%～45%FC,but biomass of Ligustrum quihoui Carr is the lowest in the above range and drought stress becomes most obvious to its growth and development.The better drip irrigation mode for Ligustrum quihoui Carr under the condition of small plot drip irrigation is that water dropper is 4or 5L/h and the irrigation amount is between 415and 470mm.