K-M Matrix and Fermion Masses

We discuss the relations between the K-M matrix and the masses of the quarks and leptons in the case of four generations, and give the exact expression of the K-M matrix in terms of the masses of quarks and leptons. The requirement that the theoretical and experimental values of the K-M ,matrix are consistent leads to an allowed range of quark masses of the fourth generation m_t'～400-1000 GeV, m_b'～50-130 GeV. In the leptonic sector.in comparison I with the neutrino oscillation experiments and supernova it seems that neutrino masses must have hierarchy as charged leptons.