Abstract: By simulating the South Atlantic Anomaly (SAA), the ranges of the SAA with different flux thresholds and energy thresholds are obtained. As an example, the time percentage of the space-based observation satellite that passes the SAA region is calculated in 24 consecutive hours and 6 months, and the influence of the SAA field on the operation time is evaluated. The results show that, for the 50 MeV energy threshold, with the maximum influence of the flux threshold on the spatial domain, the latitude difference is about 23.35%, the longitude difference is about 27.06%, and the SAA pass time difference is about 48% between 500 cm^-2·s^-1 and 100 cm^-2·s^-1 flux thresholds. For the 100 cm^-2·s^-1 flux threshold, the latitude difference is about 13.86%, the longitude difference is about 17.29%, and the SAA -pass time difference is about 31.7% between 150 MeV and 50 MeV energy thresholds.