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The interface with pinned dipole within the composite barrier in a ferroelectric tunnel junction (FTJ) with symmetric electrodes is investigated. Different from the detrimental effect of interface between the electrode and barrier in previous studies, the existence of interface between the dielectric SrTiO3 slab and ferroelectric BaTiO3 slab in FTJs will enhance the tunneling electroresistance (TER) effect. Specifically, the interface with lower dielectric constant and larger polarization pointing to the ferroelectric slab favors the increase of TER ratio. Therefore, interface control of high performance FTJ can be achieved.