基于T矩阵法，取入射激光的波长分别为300、633、800 nm，对正庚烷火烟颗粒群分形结构的多分散模型、单分散模型以及等体积的球形模型的光散射Muller矩阵元素随散射角的分布特性进行了详细的比较分析。结果表明，当λ=300 nm时，散射光能很好地反映正庚烷火烟颗粒凝团的分形结构及凝团中基本颗粒的分布特性；当λ=633 nm时，正庚烷火烟颗粒群分形结构的多分散模型和单分散模型的光散射特性基本一致；当λ=800 nm时，正庚烷火烟颗粒群3种模型的光散射特性趋于一致。

Based on the method of T-matrix, a detailed comparison of the distribution of light scattering Muller matrix elements with scattering angle on the polydisperse model, the monodisperse model and the equal-volume-sphere model of fractal structure of smoke particles is produced by flaming n-heptane, under the laser wavelength of 300, 633 and 800 nm respectively. The results show that scattering light could reflect the characteristics of the fractal structure of smoke particles and the distribution characteristics of primary particles in smoke particles when λ is equal to 300 nm, then the light scattering characteristics of fractal structure of polydisperse model and monodisperse model become identically when λ is equal to 633 nm, meanwhile, the light scattering characteristics of three models about the smoke particles produced by flaming n-heptane tend to be consistency when λ is equal to 800 nm.