The orbital angular momentum (OAM)spectrum of vector vortex beam propagating in slant atmospheric turbulence is derived based on the spiral spectrum theory,and the influence of modified Kolmogorov atmospheric turbulence on the optical field distribution and OAM spectrum of vector vortex beams with different orders is discussed.Using a rotating ground glass as a random phase screen,the optical intensity image and normalized intensity of the vector vortex beam passing through the rotating ground glass are collected experimentally.The results show that the intensity distribution of vector vortex beam is distorted and the OAM spectrum is dispersed after the slant propagation of atmospheric turbulence,and the dispersion degree of OAM spectrum increases with the increase of propagation distance.At a constant transmission distance,the larger the zenith angle,the smaller the relative power of the main OAM mode.The decrease of the turbulence internal scale,and the increase of the refractive index structure constant both lead to a decrease of the relative power of the main OAM mode.Under the same propagation path,with the increase of turbulence intensity,the intensity of the central phase singularity of the vector vortex beam gradually increases,and the vector vortex beam with high polarization order suffers less from turbulence when the topological charge is constant.