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In this paper, some numerical simulation studies on long distance transport of hazard materials from an accident of a nuclear powerstation have been showed with the Hysplit-4 model of Air Resource Laboratory, NOAA, USA. Two kinds of studies have been done : 1) A verification study shows that the Hysplit-4 model has successfully simulated the long distance transport process of radioactivity materials from Chenobyl accident site in 1986 to Munich. 2) the focus of attention of the differences of the geographic distribution of the radiactivity concentration fields between winter seasons and summer seasons has been made in case that the severe accident of Qingshan like Chenobyl would occur based on the historical meteorological fields in January or in July from 1992 to 2001. Furthermore, by making averaging of the simulated data of the concentration fields of cases separately in January or in in July, we obtain two groups of the geographic distribution of the concentration fields of hazard materials in 24 hours, 48 hours and 72 hours. The results show us that the effect region and the intensity of hazard materials are larger in winter than in summer.