Quasi-classical trajectory theory is used to study the isotope effect of oxygen atoms on the vector correlations in the O(3p)+D2 reaction at a collision energy of 25kcal/mol using accurate potential energy surface of the 3 A triplet state.The distributions of p(θr)and the distribution of dihedral angel p(ψr)as well as p(θr,ψr)are calculated.Moreover,four polarization-dependent generalized differential cross sections(PDDCSs)of product are presented in the center-of-mass frame.The results indicate that the polarization of the product presents different characters for the isotope effect of oxygen atoms.Isotopic substitute can cause obviously different effects on the four PDDCSs.