  CP violation in the B_d system is discussed in the supersymmetric grand
unified theory (GUT) with the right-handed neutrinos. Above the GUT scale, the
right-handed down-type squarks couple to the right-handed neutrinos. Due to the
renormalization group effect, flavor violations in the lepton sector may be
transfered to the right-handed down-type squark mass matrix, which affects the
CP violation in the B decay. Taking into account this effect, we compare the CP
violation in B_d \to \psi K_S and B_d \to \phi K_S processes. We will find that
a significant difference is possible between the CP violating phases in two
decay processes.
