Based on selfpumped phase conjugation experiment in two blocks of Cu∶KNSBN crystal, the influence of the incident angle and photorefractive crystal geometrical configuration on selfpumped phase conjugation properties is investigated. The maximum output of phase conjugation is found with variety in the incident angle for the same incident position. The different configurations determine different maximum output. The action of crystal geometrical configuration and incident angle in dual active regions selfpumped phase conjugation mechanism is analyzed theoretically. The relation between geometrical configuration and incident angle and selfpumped beam path and beamcoupling coefficient is built. The optimal incident angle for maximum output of phase conjugation light is given in selfpumped phase conjugation effect. Finally, the formula of reflectivity of phase conjugation beam is modified. The research lays foundation of theory and experiment for selecting the optimal incident angle in fact.