Aiming at the complexion in which the information lost in index ration, the matter element method was put forward to carry on urban ecosystem health evaluation.

针对传统评价方法中量化指标丢失信息的情况，提出应用物元模型进行城市生态系统健康评价。

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Information matter element as an special matter element has extensibility and can form extensive information space.

信息物元作为一种特殊的物元具有可拓性，从而能形成可拓信息空间。

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This paper, using the casebased reasoning techniques, adopts a methodology of extension information representation. And matter element extension information AND/OR nets is defined.

从基于案例推理技术的理论出发，采用物元的知识表示方法，定义了物元可拓与或网。

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