The concept extension and concept intension of environmental management for source water protection in plain river network are defined. The subject and object, principles and means, directions and emphases are discussed. 通过相关概念辨析、区域特征分析、水源问题诊断,给出中国东部平原河网地区水源地环境管理的具体概念及深刻内涵,明确环境管理的主体与对象、原则与手段、内容与特点;