Cross-spectral density function of polarized and partially coherent laser propagated in turbulent atmosphere was determined based on the extended Huygens-Fresnel principle and Collins Formula. Analytical expressions for spectral intensity, expansion radius and barycentric position wander of polarized Gaussian-shell model beam were obtained under horizontal transmission at different distances of external fields. The beam extension and drift of the polarized laser polarized laser propagated in turbulent atmosphere were simulated, and the changing information of laser beam′s extension and drift in the same propagating distance with different polarizing angle,initial waist widths, and wave length were got. Similar simulation was also done using the different wavelengths and the same polarization angle but with different propagation distances. The results indicated that the spread and wander of polarized and partially coherent laser propagated in turbulent atmosphere are dependent on the polarization angle and initial waist width. The spread and wander of polarized laser beam at 45° show symmetry as polarization angle varies. With initial waist width less than or equal to 0.5 mm, the spread and wander were increasingly affected by atmospheric turbulence.