According to analysis on the monitoring data that include aquatic, biologic, physical and chemical indicators of Haohe River in Nantong from 2008-2012 , the overall water quality maintained class Ⅳ or improved thanks to regular water in-flow from Yangtze River, meeting the functional needs of the area.From the perspective of biological diversity, the plankton main-ly distributed in“relatively rich” level, but the benthic diversity is poor and the dominant species has obvious advantages.This is caused by many factors such as water desilting, river dredging and pollution.It should be noted that these indexes showed a dete-riorating trend of different levels in recent years.%通过对南通市老城区护城河濠河2008年-2012年水生生物监测结果与水质理化指标的综合分析表明，濠河由于定期从长江引水，水质稳中有升，总体以Ⅳ类为主，能满足其功能区水质需要。从生物多样性来看，浮游生物主要分布在“较丰富”级别，底栖生物由于水中沉沙、河道疏浚及历史污染等受多方面因素的影响，物种多样性较差，优势种明显；各指标在近几年都呈现不同程度的减少趋势，应引起重视。
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