Abstract: Cartographic-generalization-knowledge(CGK) is vital in the whole process of(automatic) cartographic(generalization.) Three main steps were introduced in the(following.) First,the concept and structure of CGK were defined,and its organization method was given.Second,methods of mining generalization tasks,monitoring user's operations and how to assess generalization algorithms and results based on CGK were put forward.Finally,the theory and technique of saving generalization tasks were involved.The experiment demonstrates that CGK is important in cartographic generalization.CGK provides a basic reference for the assessment in generalization.