According to the monitoring data from 1984 to 2014 of the groundwater table in Yao Ba oasis, Alax League, Inner Mongolia of China, analysis the annual and interannual variation of the groundwater table and its genesis in the irrigation area. In addition, use the Surfer11 to draw the water-table contour and restore the cone of depression. Analytical results show that the dynamic type in the irrigation area is artificial exploitation type. Groundwater exploitation is a major factor causing the groundwater table dynamic change, the groundwater table characteristics and the cone of depression mainly depend on the size of exploitation.

To study the law of irrigation water infiltration in soil is the basis of putting forward reasonable irrigation system. This paper takes YaoBa Oasis in Alxa Zuoqi,Inner Mongolia, China as the research object, based on field investigations and data collection, and chooses three test sites at the field to obtain the parameters of the model. The change of soil water content in different depth was simulated by Hydrus-1D model in 30 days after irrigation. The results shows that under the local existing irrigation system, the groundwater recharge is limited, and loam is an ideal agricultural soil. The results of the simulation are in good agreement with the experimental results, so the research results can provide scientific basis for the development of a more reasonable irrigation scheme in YaoBa Oasis.