lang=EN-US>According to the test data obtained from three porphyry Cu (Mo) deposits lying respectively in Chengmenshan of Jiangxi, Wunugetushan of Inner Mongolia and Baishantang of Gansu, the authors studied the enrichment and depletion regularity of trace elements in porphyry Cu (Mo) deposits. It is found that there exists not only the enrichment of some metallogenic elements but also the depletion of some lithophile-dispersed elements and rare elements in porphyry Cu(Mo) deposits, and that the characteristics of the depleted trace elements change from one deposit to another, showing their different particularities in porphyry Cu(Mo) deposits. These elements, however, also show some general characteristics. The results of this study can provide the basis for realizing the indicator quantification in geochemical exploration.