Abstract: The effect of the kinetic energy of the atomic mass-center movement, cavity length and spacing of two cavities on the atomic transmissivity is investigated based on the consideration of a factor that the single two-level atom passes through two spatially separated single-mode cavity fields. The results show that in the case of ultra-cold atom, when the kinetic energy of the atom is high (k/k0＞1), the effect of the cavity length and the spacing between the two cavities on the transmissivity is unobvious; when the kinetic energy of the atom is low (k/k0＜1), influence of the cavity length and the spacing of two cavities on the transmissivity is obvious.