Co-seismic displacements associated with the Mw9.0 earthquake on March 11,2011 in Japan are numerically simulated on the basis of a finite-fault dislocation model with PSGRN/PSCMP software.Compared with the inland GPS observation,90％ of the computed eastward,northward and vertical displacements have residuals less than 0.10 m,suggesting that the simulated results can be,to certain extent,used to demonstrate the co-seismic deformation in the near field.In this model,the maximum eastward displacement increasea from 6 m along the coast to 30 m near the epicenter,where the maximum southward displacement is 13 m.The three-dimensional display shows that the vertical displacement reaches a maximum uplift of 14.3 m,which is comparable to the tsunami height in the near-trench region.The maximum subsidence is 5.3 m.