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The microscopic structure of the Wigne-seitz(W-S)cell in the inner crust of neutron stars is investigated with the relativistic mean field(RMF)approach.The W-S cell is composed of a cluster of neutrons and protons localized in a region around the centre and surrounded by a neutron gas of approximately uniform density.In order to generate the density of the W-S cell,appropriate boundary conditions in the calculation of the single-particle wavefunctions are necessary,We emphasize on the choice of the boundary conditions in the RMF approach.Three kinds of boundary conditions are suggested.The properties of the W-S cell with the three kinds of boundary conditions are investigated.The neutron density distributions in the RMF and Hartree-Fock-Bogoliuboy(HFB)models are compared.It is found that the neutron gas densities of the W-S cell in the RMF model is higher than those obtained in the HFB model.