The renormalization effect on a specific ansatz of lepton mass matrices, arising naturally from the breaking of flavor democracy for charged leptons and that of mass degeneracy for light neutrinos, is studied from a superhigh energy scale M 0 ∼ 10 13 GeV to the electroweak scale in the framework of the minimal supersymmetric standard model. We find that the democratic neutrino mixing pattern obtained from this ansatz may in general be instable against radiative corrections. With the help of similar flavor symmetries we prescribe a slightly different scheme of lepton mass matrices at the scale M 0 , from which the democratic mixing pattern of lepton flavors can be achieved, after radiative corrections, at the experimentally accessible scales. PACS number(s): 14.60. Pq, 12.15.Ff, 11.10.Hi Typeset using REVT E X 1