Abstract: Based on a confirmation of the troposphere-stratosphere transportation (TST) of dust aerosol in East Asia from the observational data, the TST of dust aerosol in a Mongolia cyclongenesis induced super dust storm process was analyzed by using the observational data and the NCEP reanalysis data and through the numerical simulation method. The results show that: the baroclinic instability is the dominant forcing causing the Mongolia cyclongenesis. Following the maturation of cyclone, the formation of upper level cut low led the subsiding of upper level jetstream, which induced the tropopause fold and the downward transportation of upper level potential vorticity. The folded tropopause was funnel shaped with its bottom approaching near 500 hPa. The upper level jet stream underwent quasi vertical subsiding with its core locating at the south and east sides of the cut low. Around the tropopause fold region between 300 hPa and 500 hPa, the resultant wind between the ascending motion and the western, southern and eastern wind, passed through the folded tropopause into the stratosphere horizontally or aslant upwards (through the bottom of the folded tropopause). As time goes by it approached the deep part of the stratosphere (100 hPa). The trajectory analysis shows that the air particles at the lower troposphere in the areas with dust weather occurred were raised upward driven by the spiral ascending motion over the cyclonic area. The dust aerosol transportation belt split into two branches when it got to the upper level of the troposphere. One passed through the folded tropopause into the stratosphere and then conducted an anticyclonic movement downwards within it. The other retained in the troposphere and maintained the cyclonic movement downwards. A net Stratosphere Troposphere Transportation occurred accompanying with the process of downward transportation of upper level potential vorticity. After that, a net Troposphere Stratosphere Transportation took place and its strength exhibits an exponential growth. This characteristic is favorable for the Troposphere Stratosphere Transportation of dust aerosol.