This paper has made a systematic investigation into REE，trace element and stable isotope geochemical characteristics of major Yanshanian Cu (Mo) mineralized intrusives in Zhejiang Province. The Cu (Mo) mineralized intrusi- ves in Zhejiang are mostly enriched in LREE and might be further divided into two types, one with no obvious Eu anomaly serving mostly as parent rocks of skarn type deposits, and the other with strong Eu anomaly being mostly direct ore-bearing porphyries. The Cu( Mo)mineralized intsusives con- tain relatively low Ti，Ni and Cr but comparatively high Rb，Ba，Hf，F，C1 and S.According to correlations of Sr+Ba-Li+Rb+Cs, Nb-Y, Ta-Y and Rb一Y+Nb, the Cu(Mo)mineralized intrusives mostly belong to I type, for- med by volcanic arc and synorogenic collision. Studies on Sr-O isotopic rela- tionships of these rocks indicate that the initial Sr-δ18O whole rock(%0) variation points of the major Yanshanian Cu (Mo) mineralized intrusives in Zhejiang all fall into the low 18O rock area formed by altered basalt or meteoric water-hydrothermal alteration，with the intrusives mostly exhibi- ting genetic characteristics of crustmantle mixed magma. The intrusives, may be divided into two types: one includes epicontinental depression syntectic granitoids(diorites)close to intracontinent of northwestern Zhejiang, serving frequently as parent rocks of porphyry Cu (Mo) deposits, porphyry-skarn Cu (Fe)deposits or polymetallic depositss the other includes epicontinental fault syntectic type granitoids (diorites) of southeastern Zhejiang, closely related to porphyry Mo(Cu)deposits and porphyry-epithermal Cu(Au)deposits.