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A seven-dimensional time-dependent wavepacket calculations have been carried out to study the kinetic isotope effects(KIE)of H2/D2+NH2 reactions on two full-dimensional potential energy surfaces(PESs): one is the interpolated ab-initio potential energy surface which is initially constructed by Collins and coworkers and then improved by our group,the other one is the analytical potential energy surface developed by J.C.Corchado and J.Espinosa-Garcia.The total reaction probabilities,integral cross sections and thermal rate constants are calculated for both reactants in the ground or in the first excited state.The zero point energy,tunneling effect and reactivity are also analyzed.The work indicated that the KIEs are “normal” and the calculation results with analytical PES are much closer to the experimental measurements.