Through analyzing of the water chemistry data of groundwater in Jilin city in the years of 1988~2004,the distribution and variations of ammonia-nitrite-nitrates in groundwater with time showed to have very closed relationships with their origins.The content of ammonia-nitrite-nitrates in ground-water in the area of agricultural irrigation distributed uniformly in space,while varied with rainfalls,high in precipitation seasons low in dry seasons;industrial pollution makes the content of ammonia-nitrite-nitra...