  Fermion masses and mixing angles are studied in an SUSY $SO(10)\times \Delta
(48)\times U(1)$ model with small $\tan\beta$. Thirteen parameters involving
masses and mixing angles in the quark and charged lepton sector are
successfully predicted by a single Yukawa coupling and three ratios of VEVs
caused by necessary symmetry breaking. Ten relations among the low energy
parameters have been found with four of them free from renormalization
modifications. They could be tested directly by low energy experiments.
