Large basic infrastructureSoftenSinvolve multipleSadministrative regions, withSmultiple levels between theSproject,SprojectSnumber,SprojectSexistence difference,Sthe basic infrastructure goalShas the characteristics ofSmultiShierarchy,Sat this time,Sthe single project managementStheory cannot meetSthe requirements ofSlarge basic infrastructure management,Stherefore, we need to introduceSthe principle of similarity and combine withSthe similar project in order to realize the combination ofSproject management,Sso as toSimprove the efficiency ofSlarge-scale engineering project management.SThis paperSuses the method of principal component analysis from the quality, schedule,Scost, researching and constructing of theSrecognitionSmodel of the mainSsimilarity,Son this basis,Susing the featureSindexScompare theSclustering technique, and constructSa clusteringSmodel of mainSsimilarity,Sa case is analyzed finally.