基于广义惠更斯-菲涅耳原理和Stokes参数法研究了部分相干平顶电磁光束在湍流大气中斜程传输的偏振度特性，不仅讨论了电磁光束同一极化方向上的偏振度以及交叉极化的偏振度，还讨论了光束阶数、天顶角、频率、接收高度等因素对偏振度的影响。数值分析结果表明：激光在湍流大气中斜程传输时通过提高接收高度可减小天顶角对偏振度的影响；光束偏振度随着光束阶数的增大而减小；在中心角频率附近，偏振度随着频率的增大而减小；与只考虑同极化的偏振度不同，考虑交叉极化的偏振度时，偏振度随着传输距离的增大，变化无界。

Based on the extended Huygens-Fresnel principle and the method of Stokes parameters, the model of degree of polarization (DoP) for partially coherent flat-topped electromagnetic beam propagation in slant turbulent atmosphere is studied. Not only the DoP in the same direction and the DoP in the cross-direction are considered, but also the effects of the beam order, zenith angle, frequency, receiving height and other factors on the DoP are discussed. The numerical results show that the effect of zenith angle on the DoP can be reduced by increasing the receiving height when laser transmits in slant turbulent atmosphere. The DoP decreases with the increase of beam order and the increase of frequency near the center angular frequency. Unlike the DoP only considering the same polarization，the change of DoP is unbounded with the increase of propagation distance when the cross polarization is considered.