The influence of impurity on the radiative properties of randomly oriented cluster agglomerates was mainly analyzed. The equivalent complex refractive index of aerosols containing different volume fractions of amorphous carbon was obtained by Bruggeman effective medium theory. The radiative characteristic quantities were calculated based on the discrete dipole approximation method, such as the phase function, extinction, absorption and scattering efficiency factor, singlescattering albedo and asymmetrical parameter of randomly oriented cluster agglomerates. The influence of the impurity on the radiative properties of randomly oriented cluster agglomerates was mainly discussed. The results indicate that the influence of the impurity on the radiative properties of randomly oriented cluster agglomerates is obvious, and it varies with the size parameters of the randomly distributed cluster agglomerates. This work is important for the study of radiative characteristics of aerosols with a mixture of various chemical compositions and their climatic effects.