We discuss the energy scale profile of the bimaximal mixing which is given at the grand unified theory (GUT) energy scale in the minimal supersymmetry model, associated with an assumption that Y†νYν is diagonal, where Yν is the neutrino-Yukawa coupling matrix. In this model, the Dirac mass matrix which appears in the seesaw neutrino mass matrix is determined by three neutrino masses, two relative Majorana phases and three heavy Majorana masses. All CP phases are related by two Majorana phases. We show that the requirement that the solar mixing angle moves from the maximal mixing at GUT to the observed one as the energy scale decreases by the renormalization effect. We discuss the leptogenesis and the lepton flavor violation process by assuming the universal soft breaking terms.