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Abstract: The influence of the space environment on the atmospheric density at earth edge in low-latitude regions is discussed based on the NRLMSISE-00 model. Two methods are proposed to predict the daily average atmospheric density, the simplified model method and the empirical method. The simplified method predicts the values of Ap and F10.7 for the atmospheric density at earth edge in the low-latitude regions in the 11-year period of geomagnetic activity and solar activity. The empirical method directly predicts the value of the future atmospheric density by using the daily average density in the 23rd solar cycle and by means of the Fourier transformation. The diurnal fluctuations in different altitudes can be derived by using the method of fitting curve. Thus the atmospheric density at a local time can be calculated by using the predicted average density. The error analysis for the two methods shows that the empirical method is more accurate than the simplified method. Both methods have high accuracy and are easy to use as engineering prediction algorithms for the atmospheric density at the edge of the earth.