Abstract: At present,the general methods to determine seismicity parameters in seismic risk model all emphasize to delete aftershocks.The reason is that the seismicity model used is Poisson model.But in usual,some seismic disasters are caused just by aftershocks,it may underestimate the seismic risk to delete aftershocks.Here we presented a seismic risk analysis model,in which aftershocks is included.Take Xingtai earthquake as example,we calculated the seismic risk for some sites in and out the aftershock region as well as its boundary with this model.Based on this model,changing the annual earthquake occurrence rate in the same region,we calculated the seismic risk again.Compared the two results with the results that did not consider aftershocks,it shows that it is necessary to consider aftershock activity in some regions.