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In order to explore the isotope effect on stereo dynamics, we investigate the trajectory calculations of Ar+H2+/D2+/T2+ and Ar+T2+ reactions on the ab initio potential energy surface constructed by us and calculate the distributions of product polarization P(θr), P(r) and four generalized polarization-dependent differential cross-sections. The product rotational alignment parameters (P2(j’ · k)) for the title reactions are compared and discussed with mass factors. Furthermore, the angular distributions of the product rotational vectors in the form of polar plot in θr and r are presented. The results indicate that the stereo dynamics properties of the title reactions are sensitive to the mass factor.