Luzong basin is one of most important units of the iron copper polymetallic mineralization belt in the Middle Lower Reaches of theYangtze River Area. In Luzong basin, diorite porphyrite is closely related to ore forming, but its geochemical characteristics and formation age is still controversial. In this paper, based on the study of major elements and trace elements and Sr Nd Pb isotopes, five diorite porphyrite samples were selected for zircon U Pb dating. Zircons of two samples from Wangzhuang copper deposit yielded weighted mean 206Pb /238Uages of 138±14Ma and 1345±18Ma, respectively; while zircons from three samples from Nihe iron deposit yielded weighted mean 206Pb /238Uages of 1339±19Ma、1375±16Ma and 1358±22Ma respectively. Therefore，there may be a early magmasim inLuzong basin similar to the magmasim with the ages of 140~145 Ma in the peripheral uplift area(Tonglin). However, this stage of magmasim continued to ca. 134Ma in Luzong basin，it is closely related to the metallogenic activity during early Cretaceous and has important significance on deep ore searching.