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The lattice vibration and electron-phonon (EP) coupling of three types of Pb ultrathin films were calculated from first principles. For free-standing films, our calculations showed that softening and stiffening of the surface phonons coexist. The obtained EP coupling λ and the superconducting transition temperature T C are smaller than their bulk values. For (1 × 1)-Pb/Si(111) films, the obtained λ and T C values in hexagonally close-packed (hcp) stacking are larger than those indoi:10.1088/1367-2630/13/9/093023 fatcat:jcrqdwri3zd7horoy7fvcandtu