Based on the 120000 sets of drag data, we have obtained a new atmospheric model by improving the DTM-1994 model. The new model has the following characteristics:
    1. The second order diurnal peak effect was used to replace the original complicated formula for the diurnal effect, which greatly reduces the mumbers of model paramenters (less than 50). Each new parameter has its definite physical meaning.
    2. The primary and secondary model parameters were distinguished. Within primary parameters, we further clarigy which one is able to be improved by using drag data and which one may be not.
    3. When the new model is compared with MSIS-1990 and DTM-1994 models, the systematic error is acceptable, indicating that drag data from satellites can be used to carry out dynamic adjustment of the atmosphere model. It can determine not only the total atmosphere density, but also the densities of the atmospheric components.
    4. When compared with the satellite orbits, there exists significant difference between improved model and current MSIS-1990 and DTM-1994. Around 120 km orbit, improved model density is greater than MSIS-1990 by 10%. Meanwhile, it was found that the MSIS-1990 model density was less than that of the observed atmosphere by 9% when predicton of the satellite orbit during its re-entry is done. This indicates that improved model density is close to the observed atmosphere.