AP-8 model, CRRESPRO model and PSB97 model are introduced in this paper and used to calculate the flux distribution of energetic proton between low altitude 300 and 1100km, separately, and then the calculated flux distributions are plotted as contour graph by IDL software. AP-8 model flux is mainly modulated by galactic cosmic rays and is influenced directly by solar activity. Consequently, the proton flux is higher during the maximum part of the solar cycle than that during the minimum part. CRRESPRO model comprises conditions of active and quiet earth magnetic fields, which correspond to similar flux due to the short time difference of data collection at different earth magnetic conditions. Compared results between models show that AP-8 model flux is small, CRRESPRO model flux is large, and PSB97 model flux is between the two and is the nearest to the detected value. PSB97 model is compiled specially for low altitude (under 1000 kilometers) use and is applicable to calculate energetic proton flux at low altitude in current space environmental condition, significantly for prediction of energetic proton flux in SZ spacecraft orbit.