Within　the　harmonic　approximation,　the　atomic　force　constants　have　been　derived　and　the　phonon　dispersion　curves　along　three　major　symmetry　directions　[00　zeta],　[0　zeta　zeta]　and　[zeta　zeta　zeta]　(or　in　group-theory　notation　Delta,　Sigma,　and　Lambda)　have　been　calculated　for　five　alkali　metals　Li,　Na,　K,　Rb　and　Cs　by　combining　the　modified　analytic　embedded　atom　method　(MAEAM)　with　the　theory　of　lattice　dynamics.　The　results　are　in　agreement　with　available　experimental　results　for　Li,　Na　and　K,　which　may　imply　that　the　predicted　phonon　dispersion　curves　for　Rb　and　Cs　are　correct.