The Pt nuclei with mass number around 190 are well known to displayγ-soft characteristic,and it provides the motivation for extensive studies both experimentally and theoretically.Considering its neigh- bors in this mass region,Hg and Au nuclei were found to exhibit stable oblate shape and triaxial The Pt nuclei with mass number around 190 are well known to display γ-soft characteristic, and it provides the motivation for extensive studies both experimentally and theoretically. C on cidring its neigh-bors in this mass region, Hg and Au nuclei were found to exhibit stable oblate shape and triaxial