  Following the method developed by Waldspurger and Beuzart-Plessis in their
proofs of the local Gan-Gross-Prasad conjecture, we are able to prove the
geometric side of a local relative trace formula for the Ginzburg-Rallis model.
Then by applying such formula, we prove a multiplicity formula of the
Ginzburg-Rallis model for the supercuspidal representations. Using that
multiplicity formula, we prove the multiplicity one theorem for the
Ginzburg-Rallis model over Vogan packets in the supercuspidal case.
