Abstract: Abstract: by using variational method and Huybrecht’s Linear combination operator，studied the polar slab qubit and its optical phonon effect, Using the system of electron-bulk LO phonon coupling weak, and electron-SO-phonon coupling strength. When the electron is in the superposition state of the ground state and the first excited state, we obtained the time evoiution of the electron density. This shown that the period of oscillation decreases with the strength of coupling increasing, but increases with the vibration frequency.