  The two Majorana cp-violating phases can not be determined by experiments on
neutrino oscillations. It is difficult even not possible almost to measure two
Majorana cp-violating phases since they are only sensitive to
lepton-number-violating processes. One must take some assumption on the
structure of neutrino mass matrix and their flavor mixing mechanism hidden
behind in phenomenological models in order to determine Majorana cp-violating
phases. Two models on the symmetry of the neutrino mass matrix are proposed in
this paper. The Majorana cp-violating phases and the effective Majorana
neutrino mass $\mathcal{m}_{\mathcal{ee}}$ are computed in the two models.
Using the limit of the absolute neutrino mass scale which is from cosmological
observations, the numerical values of the Majorana cp-violating phases and the
effective Majorana neutrino mass $\mathcal{m}_{\mathcal{ee}}$ are obtained.
