Suppose that the geometrical explanation to the weak CP phase in quark sector is also valid for neutrinos, the mixing and CP violation in neutrino system are discussed. We find that a J(CP) larger than 3 x 10(-3) implies the large-mixing solution for solar neutrino problem. In the case of bi-maximal mixing, we predict relative large CP violation with J(CP) larger than 10(-3) in neutrino system, except the third mixing angle approaching to 0 or pi/2 very closely.