In order to analyse the influence of the angular combination on the dynamic light scattering measurement, five groups of simulated bimodal particle system (114/457 nm, 202/800 nm, 307/541 nm, 433/721 nm and 600/900 nm) were measured at different combinations of three, four, five and six scattering angles respectively. The inversion results show that, the different angular combinations with the same numbers of scattering angles give different measuring results. When Mie-scattering intensitys corresponded to the selected angles are different significantly, especially including the maximum and minimum points, the more accurate measurement results can be gotten. The results were verified by the experimental results of a dilute bimodal suspension of polystyrene latex standard spheres. The reason for the combination influence is that the information of particle sizing is added as the number of scattering angle increases, but only when the added angles located at the points of Mie-scattering intensity different significantly would provide more information about particle sizing. However, if improper angles are choose, the benefits from increase of angles would be offset by the losses caused by angle calibration noise.