Abstract: Under the condition of control test,by cultivation in pots containing soil,with corn as material, a new water-saving technology named the Control Root-splited Alternative Irrigation(CRAI) was studied. The treatments consisted of Surface Irrigation(SI),Low Irrigation(LI) and CRAI. The period of irrigation was 3 d,5 d,7 d.The watering amount is the same with the same irrigation method.The result showed that CRAI could stimulate root growth and make root distribution uniform in the vertical profile,and root activity was increased.Besides,corp growth of CRAI with 5 d was more improved better than that of SI with 3 d and water use efficiency was increased by 26%. Although no difference was found between the crop growth of CRAI with 7 d and that of SI with 5 d,WUE was improved by 20%.