Theoretical simulations for LHC physics is quite important for experimental search. and we will introduce our relevant works on Spin-2 particles, in special the Gravitons in Extra Dimensions. After reviewing the details on implementing spin-2 particles in the popular LHC simulation tool: MadGraph/MadEvent, we will talk about the use of it for phenomenology study at the LHC, including results of LO QCD, NLO QCD and Parton shower matching with matrix elements. Finally, we will also mention our recent similar work for Spin-0 Higgs, which is the most important goal of the LHC.