Information Technology Journal 1812-5638 1812-5646 Asian Network for Scientific Information 10.3923/itj.2012.554.556 Hong-xu Wang 4 2012 11 4 Given a transforming formula from the single value data to vague data. And presented a similarity measure formula between vague sets. In choosing location of tailings dam, the detailed steps of the VO algorithm are that: (1) Establish an index set; (2) Screen out the locations of tailings dam; (3) Draw an expectation location of tailings dam; (4) Get into vague environment. The original data turn the vague data. Get vague sets of the locations of tailings dam and vague set of a expectation location of tailings dam; (5) Calculate similarity measures. Calculate similarity measures between vague sets of the locations of tailings dam and vague set of a expectation location of tailings dam; (6) Vague optimize sort. By the numerical size of the similarity measures can be the sorts. Vague sort: similarity measures corresponding to those in greatest numerical size that is the best a location of tailings dam. The application example shows that this algorithm and these formulas are useful.

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