  The (B_{d}\longrightarrow \Phi K_{s}) process is without tree level decay
amplitude . Then the SUSY contributions may be significant . We calculate the
neutralino and gluino penguin contributions to the CP violating phase in (SU(5)
) grand unified theory with right-handed neutrino (SU(5)_{RN}) . We find that
the SUSY contribution may change the phase in (B_{d}\longrightarrow \Phi K_{s}
).
