Abstract: For event is a part of event scenario, a hierarchical classification based on event target and intention is presented, which is extensible for different multi-dimension classification space that can be defined in each layer. Seven quantitative specifications are given to define event’s critical value which is used to grade. The event database based on this method of classification and gradation shows its advantages: easy to be searched and extended.

Key words: Event; Classification; Gradation; Event database

摘要： 从事件作为事件情景的一个组成部分出发，提出了一种基于事件对象和意图的层次化分类方法，通过每层定义不同的分类多维空间使得该分类方法具有很好的扩展性。提出了7 个量化指标定义事件的危害值，对事件进行分级。利用该分类和分级方法进行了事件库的设计，显示出这种分类和分级方式的优越性：容易对事件进行定位，可扩展性强。

关键词: 事件；分类；分级；事件库