Based on the time axis and flow-stock axis,this paper analysed Japan's economy at different stages of their own characteristics after the great east Japan earthquake.Japan's post-disaster reconstruction situation is grim,because it is a hard reconstruction with five kinds of trend.They are the reconstruction under demographic liability,the reconstruction to the local time,the reconstruction with the fiscal deficit,the reconstruction under the conditions of economic globalization,and the reconstruction under energy constraints.The post-disaster reconstruction goals should change the top five problems into opportunities. <<