Abstract: The approaching degree is a fuzzy evaluation method which has a recognizing function. This method is used for grading division and has certain applicability. Now it has been widely used in evaluation on pollution status of heavy metals in soil and water environmental quality. In this paper, based on monitoring the riparian zone in Tieling section of Liao River, the approaching degree method was applied to assess the riparian health. The riparian zone of Tieling section of Liao River was at a good healthy level. The suitability of the method was examined according to both the goodnessoffit between the evaluation result and the actual situation, and the deviation degree of the evaluation results. We concluded that the approaching degree method was suitable for the riparian health assessment.

Key words: PAR utilization, dry matter, stable yield., grain yield