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Hydrogen functionalization on graphene has attracted tremendous research interest for optimized characteristics of nanodevices.Systematic molecular dynamics simulations have been performed to investigate the mechanical properties of hydrogen functionalized graphene and related allotropes.The effect of the degree of functionalization and hydrogen arrangement on the mechanical properties and failure process are investigated.For graphene materials with hydrogen atoms randomly arranged on the surface, the intrinsic strength deteriorate drastically with increasing ,H-coverage within the sensitive threshold, beyond which the mechanical properties remain insensitive to the increase in H-coverage.