51 hours after the MW7. 3 earthquake，the Tohoku MW9. 0 earthquake，Japan in March 2011 occurred and caused a huge disaster． Seismologists used many different data and methods to discuss the relationship between these two earthquakes and the results showed that the MW7. 3 earthquake was a foreshock of the Tohoku MW9. 0 earthquake of Japan． We calculated the static coulomb stress of the MW7. 3 earthquake and the M7. 0-class sequence events，and the result shows both the MW7. 3 and the M7. 0-class sequence events did not trigger the Tohoku MW9. 0 earthquake directly，but the stress load effect to the main shock and peripheral zone was clear． In general，the MW7. 3 earthquake triggered the Tohoku MW9. 0 earthquake，Japan． We use the results of Suitor et al． ，(2011) which analyses the difference of the general earthquakes and the earthquake with the generalized foreshocks based on the GPS data and geodetic inversion． In terms of the long-term GPS time series，the M7. 0-class earthquakes from 2005 to 2011 might be regarded as the generalized foreshocks of the Tohoku MW9. 0 earthquake．