Research on Fuzzy-grey Relation Optimal Selection Model for Natural Gas Construction Investment Plans

Combined with factors of economic benefit,resource benefit,social benefit and environmental benefit,the economic evaluation system on natural gas construction projects is built up.Moreover,based on advances of fuzzy mathematics and grey system theory,the fuzzy-grey relation optimal selection model is established.By application of this model on optimal selecting natural gas construction investment plans in Deyang,Sichuan,it shows the results derived from this new model correspond to the objective reality.