Abstract: A formula for calculation of the thermal neutron scattering law for the anisotropic microcrystal which is based on Fourier transform is derived in the paper. A formula for calculation of Debye-Waller factor is derived,too.The analyses for calcuated results of anisotropic graphite are presented. It is shown that the method is effective and it is necessary to take the co-rrect value of Debye-waller. factor.