关键词: 应急预案，框架表示，基于案例推理，最近部法

Abstract: The structured technology of frame expression can express static preplan. The structure of preplan library and index were designed by using relation model. At the same time, cascbased reasoning method and nearest neighbor method were unified, and the similarity of emergent events and preplan was calculated, therefore optimal similarity search was achieved.

Key words: Emergency preplan, Frame expression, Cas}based reasoning, Nearest neighbor method