As the biggest tributary of the Yellow River,the Weihe River was confronting more and more serious effects from human being activities.The purpose was to explore the variety of NO-3-N and NH+4-N along the Weihe River and possible factors affecting them.It can be characterized by the results that the water pollution along the middle and down stream and its tributaries of Weihe River was mainly exceed by NH+4-N,part sampling sites were nearly close to the critical value of the safe drinking water standard.As ...