  We propose a phenomenological formula relating the Kobayashi-Maskawa matrix
$V_{KM}$ and quark masses in a form $(m_d,\ m_s,\ m_b)\propto (m_u,\ m_c,\
m_t)V_{KM}$. The formula agrees with experimental data well and has an
interesting geometric picture. The origin of such a formula is discussed in the
standard model.
