To realize the molecular design of new functional silver(I) clusters, a new synthetic approach has been proposed, by which the weakly coordinating ligands NO3- in a Ag-20 thiolate cluster precursor can be substituted by carboxylic ligands while keeping its inner core intact. By rational: design, novel atom-precise carboxylic or amino acid protected 20-core Ag(I)-thiolate clusters have been demonstrated for the first time. The fluorescence and electrochemical activity of the postmodified Ag-20 clusters can be modulated by alrestatin or ferrocenecarboxylic acid substitution. More strikingly, when chiral amino acids were used as postmodified ligands, CD-ctivity was observed for the Ag-20 clusters, unveiling an efficient way to obtain atom-precise chiral silver(I) clusters.