The numerical simulation on the long distance process of a dust-storm event based on conputer science need us to couple a long distance transporting model with a meteorological model. Here we show a numerical simulation study for a dust-storm event in 2003. In this study, a long distance transporting model, called Hysplit-4 model by NOAA,USA , has been coupled with a meteorological model,called MM5v3 by NCAR,USA.The simulation results show us that the simulated concentration fields in 24h can

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... regard as an acceptable numerical simulation result, however, with the integration time increasing up to 48 hours, the numerical simulation results can not be acceptable as a good simulated result. After checking the vertical structure of the simulated concentration field, we found that the discontinuity of the concentration field in space may be responsible for this bad performance of numerical simulation results. Some discussions about solving this problem are also explained at the end of this paper.