Abstract: In order to improve the urban river and its surrounding environment, it is very important to follow up and grasp the development status of the river in time and strengthen the research of the comprehensive evaluation method of the urban river health. It analyzes the natural and social characteristics of river channels in small and medium-sized cities, puts forward the evaluation method of river channel dynamic index based on AHP, discusses the construction process and evaluation process of its evaluation index system, and applies the evaluation method to the health evaluation of Biandan river in Wujin District of Changzhou city.