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The high strength reported in pristine graphene stimulates great interest in utilizing high strength and stretchable graphene for biological structures and electronic devices.Current synthesis techniques for large-area graphene result in the appearance of grain boundaries.Although there has been good understanding on how typical defects like dislocations and grain boundaries influence the strength of three-dimensional polycrystals, how grain boundary defects like pentagon-heptagon rings (5-7 rings) in the two-dimensional graphene influence its mechanical properties remains a big unknown, since graphene challenges the applicability of the existing theories that have been previously used for characterizing its three-dimensional counterparts.