  The strategy of constraining the lepton flavor mixing from remnant CP
symmetry is investigated in a rather general way. The neutrino mass matrix
generally admits four remnant CP transformations which can be derived from the
measured lepton mixing matrix in the charged lepton diagonal basis. Conversely,
the lepton mixing matrix can be reconstructed from the postulated remnant CP
transformations. All mixing angles and CP violating phases can be completely
determined by the full set of remnant CP transformations or three of them. When
one or two remnant CP transformations are preserved, the resulting lepton
mixing matrix would depend on three real parameters or one real parameter
respectively in addition to the parameters characterizing the remnant CP, and
the concrete form of the mixing matrix is presented. The phenomenological
predictions for the mixing parameters are discussed. The conditions leading to
vanishing or maximal Dirac CP violation are studied.
