In order to research the law of water demand of walnut under micro-spray irrigation at semi-arid region of Shanxi,and plan rational irrigation schedule,taking ten-year-old Xiangling walnut as materials,the dynamic change of soil moisture in walnut root zone under different irrigation amountin the semi-arid area of Lüliang Mountain under the condition of micro-irrigation was explored and effects of different irrigation amount on growth,water consumption and yield during the whole growth period were studied.The results of field experiments showed that the new shoot length,leaf area,fruit longitudinal,transverse diameters and yield increased with the increase of irrigation quantity,but the rate of increase was reduced. When the irrigation water quantity was 120 m³/ha,the irrigation capacity could meet the water demand of walnut and get high yield and improve water efficiency.The total water consumption during the whole growth period increased with the increase of irrigation water.The water consumption intensity at the bud period was the largest,the fruit expansion period was the critical water demand period,and hard-core period was the maximum period of walnut water demand. Under the conditions,the micro-irrigation schedules for walnut were:irrigation quota of 120 m³/ha and irrigation frequency of 5 times,with one time at the flowering period,hard-core period,and oil conversion period respectively and two times at the fruit expansion period.