The paper uses extension theory and puts forward the potential information mining methods based on matter-element extensibility, and probes into the divergent method, correlative method and implicit method of potential information mining.

The application and improvement of the matter-element extension method used in water quality assessment of the Yellow River;

Evaluation of atmospheric environment quality based on weight value analysis of matter-element extension and verification with example;

Combined matter-element extension method and flood damage intensity index with analytic hierarchy process,a comprehensive evaluation model of flood damage intensity is established.

Application of Matter-Element and Extension to groundwater quality evaluation;

In view of the diversity of the water quality evaluation and incompatibility of evaluating results given by single index,the authors establish the groundwater quality evaluation model using the matter-element and extension method.

The approach is based on constructing classical and extensional matter element matrixes for various plant cover classification using matter element and extension set,calculating the cognate degrees between the body to be r.