Abstract: Late Mesozoic volcanic rocks in southeastern Zhejiang Province can be subdivided into three stratigraphic cycles. The εNd(t)values for these three cycles，from bottom to top，are -14.1 to –6.2, with an average of –10.0; -7.7 to –6.3，with an average of –7.0; and -7.5 to 0，with an average of –4.6，respectively. T2DM for the three cycles are 1.6 to 1.8， with than average of 1.72Ga; 1.4to 1.6，with an average of 1.48Ga; and 0.9 to l.5 with an average of 1.3lGa，respectively. Vo1canic rocks from different cycles show significant variation in Nd isotopic compositions, indicating that the tectonic environment of formation and the magma source of volcanic rocks varied with time. Therefore. Nd isotopic compositions of the volcanic rocks are very important in stratigraphic division and comparison