主要分析了拉盖尔高斯(LG)光束在中强度湍流大气中的传输特性。利用分步傅里叶法和相位屏法仿真了在水平通信链路和上下行通信链路情况下LG光束的强度分布、相位分布及螺旋谱分布情况。仿真发现大气湍流会影响LG光束的传输性质，而且拓扑荷和折射率结构常数越大，影响越大。另外，还发现上下行链路中LG光束受到大气湍流的影响比水平链路中受到的影响小。

The propagation of Laguerre-Gaussian beam in intermediate fluctuation turbulent atmosphere is studied. Using the split-step Fourier method and the phase screen method, the intensity distribution, phase distribution and the spectrum distribution of LG beam are simulated in the case of up-downlink communications path and level communication path respectively. It is found that the atmospheric turbulence will induce the spread of the spiral spectrum. With the increase of the topological charge and refractive index structure constant, the spectrum spread becomes more serious. It is also concluded that the influence of the atmospheric turbulence on the Laguerre-Gaussian beams is smaller in up-downlink communication path than in level communication path.