Abstract: Groundwater in Zhangshi irrigated area is seriously polluted by both organic and inorganic pollutants, the spatial distribution of pollutant and characteristics are as a result of various sources of pollutant. The authors simply summarize the spatial distribution of pollutant enrichment factor and factor analysis methods are applied to study the sources of pollutant, and the contributing degree of each source. The result shows that the sources of pollutant mainly include non-point-source, line-source and point-source, with NH⁺₄, NO^-₃, SO^2-₄, phenanthrene, BHC, Fe and Mn mainly from non-point-source, NH⁺₄, Hg, Cd, COD, phenanthrene, BHC mainly from line-source, and SO^2-₄, dimethoate and CN^- from point-source.Taking acconnt of above discussing,groundwater is not only pollutant by pesticide and fertilizer, but also by waste water from chemical plunt.

Key words: groundwater pollution, enrichment factor, factor analysis