Duetotheinteractionbetweenthemainhullandsidehulls,differentlayoutsandlengthsofsidehullsaffectthewaveloadssignificantly.Basedonthree-dimensionalpotentialtheoryandGreen'sfunction,thisarticlegivesthesignificantvaluesforwaveloads,includingverticalshearforcesandverticalbendingmomentsatdifferentlocationsonthemainhull,andtransversebendingmomentsatthejunctionofthecrossstructureandmainhull.Inaddition,aparametricoptimizationofwaveloadsfordifferentlayoutsandlengthsofsidehullswereperfomed.Severalspeedsandwaveheadingswerealsoconsidered.Finally,spectralanalysiswasconductedtoattainloaddistribution.Theconclusionsofthisstudyareconducivetothedesignandoptimizationofthisnewtypeofship.