The effect of orientation degree on high-frequency magnetic properties of planar anisotropy carbonyl-iron particles is studied. We build the samples for planar carbonyl-iron particles, whose magnetic moments obey Gaussian distribution. Meanwhile, we obtain a new method about complex permeability by utilizing Landau-Lifshitz-Gilbert equation. Then the frequency-dependent complex permeability of sample is calculated using our method. The result shows that with the increase of orientation , the standard deviation of Gaussian distribution decreases and the orientation degree f increases. Furthermore, the real part of initial permeability of the planar carbonyl-iron sample becomes higher with the increase of orientation degree f. For comparison, we measured the orientation degree and complex permeability of the sample by Mssbauer spectroscopy and vector network analyzer respectively. It is found that our experimental data accord well with the simulation results.