Several new methods of optimum-seeking of deposit economic evaluation schemes are briefly and systematically introduced, they are: multi-objective scheme fine-ordinal method of decision, grey situation decision method and grey administrative-levels decision method, the optimum-seeking of some gold deposit economic evaluation scheme is studied with these methods, the results are satisfact.

On the basis of the AHM determining the indexes weight,this paper utilized the Grey Correlation Decision-making model to optimize the immigration allocation area selecting,and finally verified the model through an actual case and the collected information of Jiang-ya reservoir migration.

Introducing the grey decision-making theory in the optimization of constructional parameters,the problem to transform multi-object optimization including the rates of ore recovery,undiluted ore recovery and rock drop-in into a single-object optimization was successfully solved.

The paper introduces the way of applying information entropy method to ascertain the indexes weights, researches the basic principles of grey decision-making, analyses the influence factors of building construction programs biding evaluation and builds the mathematic model.

With biodiversity, caterpillar population density and control cost as indices, optimal inoculating frequency and dosage were determined based on grey decision-making method.