Abstract: By comparing the river ecological assessment standards in different regions,on the basis of the existing commonly used ecological river and lake assessment standards,combined with the characteristics of rivers and ecological environment in the plain river network area of Northern Jiangsu Province,an evaluation index system of plain river ecological status is established,including aquatic organisms,water ecological environment,water space,water safety and public satisfaction. The two indexes of“quality of water”and“public satisfaction”are set as veto items. In view of the analytic hierarchy process-fuzzy comprehensive evaluation model method of the evaluation index system,this paper uses the analytic hierarchy process to determine the index weight,and calculates the membership degree of the index by the classification standard,and then obtains the river ecological status assessment results through the corresponding fuzzy evaluation calculation. Taking Zongliutang River in the plain river network area of Northern Jiangsu（Suqian）as the research object,the results show that it is“medium level”.The conclusion reflects the reality characteristics of the river objectively,which is in line with the actual ecological status of the river in the evaluation year. The case study shows that the proposed evaluation criteria,index system and model calculation method can comprehensively consider the impact of regional river characteristics and the operability of the evaluation model,which provides some reference for similar researches.