Based on self-pumped phase conjugation experiment in Cu-doped KNSBN crystal, the influence of the photorefractive crystal geometry configuration on self-pumped phase conjugate properties was investigated.The maximum output configuration is funded in variety in the position.The different configuration carry with them corresponding maximum output position.The action of crystal geometry configuration on the two coupled interaction regions self-pumped phase conjugate mechanism was analyzed with theory.The relation between geometry configuration and incident position and beam path and beam-coupling coefficient was built.The optimal work position in self-pumped phase conjugation effect was given.