Inthispaper,adrivingstressfiniteelementmethodofelastic-plasticlargedeformationbasedonimplicittimeintegratingalgorithmandaneight-chainmolecularnetworkmodelisusedforthenumericalsimulationofthesimplesheartestofpolycarbonate(PC)materials.Thesimulatedresultsarecomparedwithexperimentalones.Thestrainlocalizationpropagationfortheshearbanddeforma-tionforsimplesheardeformationisinvestigatednumerieaUy.TheeffectsofmicrostructureparametersinthemodelonstrainsofteningandorientationhardeningofthePCarediscussedindetail.