Abstract: Firstly the method of Krige analysis was used to draw up the isograms of spatial distribution according to the statistics of NH⁺₄,NO^-₂,NO^-₃ ions in Changchun groundwater in 2006. The densities of the three kinds of nitrogenous compounds changed higher in the northeast and the northwest of the area from the isograms, the density of NO-3 ion was higher clearly from northeast to southwest than the other regions. From the linear form polluted character, it is so pointed out that the main cause was that irrigating the field with polluted water and excessive agriculture chemicals and the pollutant poured into groundwater. The secondly Krige method in a pure time area was used to estimate and appraise the changing trend of nitrogenous compounds, verifying its forecasting function. The result implies the groundwater quality was fairly good in Changchun area, but the density of nitrite moved upward clearly in every area and specially in the area around the city, the consistency of the three kinds of ions changed fairly higher and changing trend would rise, it was connected with human activity and, so it needed to be controlled and prevented.Firstly the method of Krige analysis was used to draw up the isograms of spatial distribution accordingto the statistics of NH⁺₄,NO^-₂,NO^-₃ ions in Changchun groundwater in 2006. The densities of the three kinds of nitrogenous compounds changed higher in the northeast and the northwest of the area from the isograms, the density of NO^-₃ ion was higher clearly from northeast to southwest than the other regions. From the linear form polluted character, it is so pointed out that the main cause was that irrigating the field with polluted water and excessive agriculture chemicals and the pollutant poured into groundwater. The secondly Krige method in a pure time area was used to estimate and appraise the changing trend of nitrogenous compounds, verifying its forecasting function. The result implies the groundwater quality was fairly good in Changchun area, but the density of nitrite moved upward clearly in every area and specially in the area around the city, the consistency of the three kinds of ions changed fairly higher and changing trend would rise, it was connected with human activity and, so it needed to be controlled and prevented.

Key words: Changchun area, groundwater, Krige analysis, nitrogenous compounds, distribution, forecast