9.60 meters deep continuous soil samples were taken from a farmland using a Geoprobe6620DT in order to investigate the distribution of nitrogen in the deep soil,the effects that soil texture and moisture respectively had on it and the risk of groundwater contaminated by the current rate of nitrogen fertilizer application.The results showed that the overall distribution of NO-3N concentration gradually decreased with depth,while NH+4N concentration remained at low levels in the whole soil profile except for the accumulation layer.Both the NO-3N and NH+4N accumulation layers were below the root absorption zone,and the leaching depth were both below 960 meters,posing a potential threat to groundwater quality.Soil texture had a significant influence on nitrogen concentration distribution,and nitrogen concentration was positively correlated with soil moisture in the deeper soil profile.