第 卷第 期 环境科学与管理 46 6 y of Engineering, Handan 056038, China; 2. Hebei Key Laboratory of Intelligent Water Conservancy, Handan 056038, China; 3. Water Resources and Water Ecological Engineering Technology Research Center. Ministry of Water Resources, Beijing 100038, China;4. Beijing Water Science &Technology, Beijing 100048, China; 5. Beijing Yongding RiverManagement Office, Beijing 100165, China) Abstract :Water environmental compensation system is an important measure to establish the system of ecological civilization and promote the construction of ecological civilization. In the process of setting up water ecological compensation mechanism, the compensation amount should not only be determined according to the water quality and quantity of cross - border sections of the river. The construction tasks of sewage treatment projects supporting the improvement of the water quality of the river should be considered as a whole, which is particularly important for the overall quality improvement of the regional water environment. This paper introduces in detailbased on the dual assessment of cross - border water quality and sewage treatment tasks, the content, ac- counting method and implementation effect of regional compensation f