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We propose a E_6 inspired supersymmetric model with a non-Abelian discreteflavor symmetry; SU(3)_c x SU(2)_W x U(1)_Y x U(1)_X x S_4 x Z_2. In ourscenario, the additional abelian gauge symmetry; U(1)_X, not only solves themu-problem in the minimal Supersymmetric Standard Model(MSSM), but alsorequires new exotic fields which play an important role in solving flavorpuzzles. If our exotic quarks can be embedded into a S_4 triplet, whichcorresponds to the number of the generation, one finds that dangerous protondecay can be well-suppressed. Hence, it might be expected that the generationstructure for lepton and quark in the SM(Standard Model) can be understood as anew system in order to stabilize the proton in a supersymemtric standard model(SUSY). Moreover, due to the nature of the discrete non-Abelian symmetryitself, Yukawa coupling constants of our model are drastically reduced. In ourprevious work, we actually have found much success. However, we also have tosolve Higgs mediated FCNC at tree level, as is often the case with suchextended Higgs models. In this paper, we propose a promising mechanism whichcould make cancellation between Higgs and SUSY contributions.

Cancellation Mechanism of FCNCs in S_4 x Z_2 Flavor Symmetric Extra U(1) Model