The stereodynamics in the chemical reaction He+H+2 and its isotopic variants at the collision energy of 145 kJ/mol have been studied by using the quasi-classical trajectory （QCT） method on AQUILANTI surface. The correlated k-j′， k-k′-j′ angular distributions, and the product rotational alignment are discussed in detail. The calculations indicate that the stereodynamics of the reactions of He+HH+→HeH++H, He+HD+→HeH++D and He+HT+→HeH++T are sensitive to the mass factor and the repulsive energy of diatomic molecule.