We report the measurement of violation parameter, at the KEKB asymmetric collider using a data sample of recorded at the resonance with the Belle detector. The decays of meson to the eigenstates used in this analysis are: , , , and . The flavor of another meson is identified by either high momentum lepton or . The distance between the two decay vertices are is measured with the silicon vertex detector, and is obtained by the asymmetry of the distribution of the distances. The preliminary result is .