Rencently, angle-resolved ultraviolet photoemission measurements of the Fermi surface contours for Mo(Ol1) and W(Ol1) are reported. The electron contour of W(Ol1) is expanded upon hydrogen adsorption, which implies that the surface states consisting of electron pockets are shifted to higher binding energy. This phenomena can be explained by the band flattening. We explained here the reconstruction of W(Ol1) surface induced by adsorption of hydrogen in terms of band flattening of surface states with a combination of S. E. Trullinger long range dipole-dipole interaction force and Kohn anomaly.