在相距890 m的水平路径上进行了激光大气传输实验，在弱湍流条件下，利用到达角起伏方差与闪烁指数分别推导出大气折射率结构常数。测量结果表明：两种方法推导的结果总体趋势一致，但在数值上存在一定差异。然后从折射率起伏频率响应特性与内外尺度变化对测量的影响角度来定量分析差异的原因。结果表明：高波数涡旋对闪烁法测量结果贡献大，而低波数涡旋对到达角起伏法测量结果贡献大；内尺度变化对闪烁法测量结果影响较大；外尺度变化对到达角起伏法测量结果影响较大。到达角法测量结果反映了大尺度湍流场的变化，而闪烁法测量结果反映了小尺度湍流场的变化。

With the purpose of comparing the differences of reflective index structure constant measured from angle of arrival and from scintillation effects, an experiment of laser propagation in atmosphere is conducted at a distance of 890 meters in the horizontal path. Scintillation index and variance of angle of arrival fluctuations are applied respectively to deduce the refractive-index structure constant in weak turbulence. The measurement results indicate that there are some differences between the two results, but the overall trends remain the same. The reason for the differences is analyzed quantitatively from two perspectives: the frequency response characteristic of refractive index fluctuation and the effect of the change of inner and outer scales on measuring. The simulation results show that scintillation is more easily affected by large scale turbulent vortexes, but angle of arrival （AOA） fluctuation is more sensitive to small turbulent vortexes. The change of inner scale has a greater influence on the result of scintillation measuring; while the change of outer scale has a larger effect on the result of the arrival-angle fluctuations measuring. The result of the arrival-angle fluctuation measuring reflects the change of large scale turbulent fields, while the result of scintillation measuring reflects small scale turbulent fields.