  We discuss the prospects of a very long baseline neutrino oscillation
experiment from HIPA to Beijing. The current understanding of neutrino
oscillations, both theoretically and experimentally, are summarized. The figure
of merits for interested physics measurements are defined and compared at
different distances: 300 km, 700 km, 2100 km and 3000 km. We conclude that a
baseline more than 2100 km is optimal. A large water cerenkov calorimeter was
proposed and its performance is satisfactory from a Monte Carlo simulation
study. Such a large detector can do many other measurements on cosmic-rays
physics and astrophysics.
