By using matrix to describe the polarization characteristic of photon and atmosphere scattering theory, the relationship between the polarization degree of four different polarized photons in “BB84 protocol” after single scattering and the forward scattering angle is analyzed. It is shown that single scattering does not have influence on photon polarization state, while the degree of linear and circular polarization are changed, especially, those of the perpendicular polarized photon are changed obviously. Also, it is founded that linear polarization degree of four different polarized photons keep unchanged when scattering angle is less than 0.25 rad, and the quantum information is still survive at the same time, we study the influence of atmosphere scattering on different wavelength polarized photons, it is shown that the polarization degree of longer wavelength photon change less than that of short wavelength photon.