Abstract: In order to eliminate the semantic heterogeneity in representing process of the spatio-temporal changes，a three-tuple model CAR for representing the spatio-temporal change is proposed based on the geographical object set before change and the geographical object set after change，change type and rules.In this model，the C denotes the change type；A denotes the attribute set；R denotes the judging rules of change type.The rule is described by the IF－THEN expressions.By the operations between R and A，the C is distinguished.This model overcomes the limitations of current methods.And more，the rules in this model can be easy realized in computer program.

Key words: spatio-temporal change, knowledge representation, three-tuple model, semantics

摘要： 为了消除时空变化表达过程中语义的不一致性，将时空变化前后的实体集、变化类型、规则作为变化表达的3个基本元素，利用数据+知识包的形式建立了基于3个基本元素的时空变化表达的三元模型CAR，即变化类型C、变化属性集A和变化判定规则集R，其中规则集中的规则利用IF－THEN方式描述，利用属性集A和规则集的运算判定C，从而解决了目前时空变化表达方法存在的无法表达变化原因的缺陷，而且规则表达便于计算机程序实现。

关键词: 时空变化, 知识表达, 三元模型, 语义