Band structure of energy of liquid alkali metals has been presented. In the structure of the theory the important in gradients are the form factors and the structure factors. As the approach rests heavily on the assumption that the potential is considerable weak. The alkali metals have been favourite of theoretical account of their simple free electron like nature band structure study and Fermi surface measurements. The discrepancy in the computed results can also be attributed to the neglect of various harmonic effects such as multiphonon processes and partially due to magnitude of form factors and energy wave number characteristic. The various properties can be evaluated from total energy depending on ionic co-ordinate.