  Based on the relation between weak CP phase and the other three mixing angles
in Cabibbo-Kobayashi-Maskawa matrix postulated by us before, the ranges of rho
and eta have been estimated by using the best known two KM matrix elements Vud
and Vcd (or Vus). It is found that, the upper limit on eta is about 0.008 which
is consistent with that estimated by Wolfenstein more than ten years ago but
far small than the present popular estimation.
