1. School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, China;
2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Regions of Ministry of Education, Xi'an 710054, China;
3. Engineering Research Center of Groundwater and Eco-Environment of Shaanxi Province, Xi'an 710054, China;
4. Xi'an Center of Geological Survey, CGS, Xi'an 710054, China;
5. Business College of Xi'an University of Economies and Finance, Xi'an 710100, China

To understand the lag response time of precipitation infiltration recharge in shallow groundwater area of Mu Us sandy land, identify the influencing factors of the lagging recharge and provide scientific basis for hydro-ecological protection and groundwater resources evaluation, the response mechanism of soil water content and groundwater table to precipitation infiltration are studied in the aeolian sand region of Mu Us sandy land in Northern Shaanxi, using field monitoring data and correlation analysis. The relational expressions of precipitation infiltration responses with other factors are analyzed based on soil water equilibrium analysis. The result shows that the response depth of water content to the precipitation is 0~10cm after small rain, 10~90 cm after moderate rain, more than 90cm after heavy rain and storm rain. The max response depth is in obvious linear correlation with precipitation. The infiltration response depth of current precipitation increases with previous cumulated precipitation when groundwater is steady, and the influence period of previous accumulated precipitation on current precipitation infiltration is within 144 hours. The response of both water content in soil and groundwater recharge lags behind the precipitation. The response lag time of infiltration is positively proportional to soil depth and inversely proportional to the difference between precipitation intensity and soil initial hydraulic conductivity.