Based on geological and geochemical exploration data of more than twenty copper and polymetallic deposits,including data of regional geology,ore belts(orefields)and ore deposits on different scales,the authors put forward the geochemical method for quantified appraisal of anomalies in large deposits.Through the systematic study of geochemical anomalies of different sizes,this paper has tentatively summed up geochemical quantified evaluation and predictin indices for appraisal of larg size ore deposits.