In　this　paper,　we　carry　out　a　comparison　study　between　classical　plate　theory　and　＇bottom　to　top＇　atomistic-continuum　multiscale　model　regarding　the　prediction　of　bending　of　monolayer　graphene　to　state　the　general　feasibility　of　classical　plate　theory.　We　replace　the　commonly　used　interlayer　spacing　value　by　the　newly　launched　intrinsic　material　thickness　value　as　the　monolayer　graphene　thickness.　Based　on　this　correction,　we　amend　the　flexural　rigidity　and　find　that　classical　plate　theory　gives　a　much　better　prediction　of　the　force-bending　deflection　curve　for　various　graphene　obtained　by　the　atomistic-continuum　multiscale　approach.　The　onset　of　weak　nonlinearity　observed　by　the　atomistic-continuum　approach　is　at　a　midpoint　deflection　of　similar　to　0.01　nm,　approximately　0.14　w/h　ratio,　which　secondarily　confirm　the　feasibility　of　our　newly　proposed　intrinsic　material　thickness　value.　The　effect　of　boundary　constraint,　graphene　size　and　loading　mode　on　the　bending　of　graphene　is　discussed　to　explain　the　cause　of　deviation　between　the　two　methods,　and　finally　we　confirm　the　feasibility　of　classical　plate　theory　on　bending　monolayer　graphene.