The paper analyzes the main reasons for corrosive damages on city heat-supply pipelines,sums up main types for the electrochemistry corrosive damages at heat-supply pipelines,introduces the methods,types and features of the cathodic protection,points out the technical neces-sity for the cathodic protection engineering scheme by combining with the heat-supply pipeline features,and indicates the controlling points of the technique in the anti-corrosive protection of heat-supply pipelines from the design,construction and uses.%分析了城市供热管道发生腐蚀破坏的主要原因，归纳了供热管道发生电化学腐蚀破坏的主要类型，介绍了阴极保护的方法、分类及特点，并提出了结合供热管道特点设计阴极保护工程方案的技术必要性，从设计、施工和使用等环节论述了阴极保护技术在供热管道防腐保护中的控制要点。
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