There are a lot of debates about the age of mineralization of Xuejiping porphyry copper deposit, Yunnan province. For determination of the time limit of beginning of the mineralization, the zircons from the ore-bearing porphyry in sericite-quartz alteration belt at Xuejiping porphyry copper deposit was taken to do the SHRIMP U-Pb dating, and the result was 215.2±1.9Ma, which indicated that the mineralization acurred after 215Ma. Hf isotope composition of the zircons show the magma come from mantle source. The distribution of the Hf isotope data are not homogeneous. εHf(t) of 8 zircons range from 1.1 to 2.1, and average of two stage model ages is 1150Ma. But εHf(t) of 2 zircons are 7.4 and 6.0 respectively, and the corresponding two stage model ages are 778Ma and 869Ma. These data show the existence of two magmatic source, and magma mixing, which should be proved through farther study. Regional isotope chronology data indicated that the magmatism of 215 Ma was main heat event controlled the mineralization of porphyry copper deposits.