A numerical simulation using large eddy simulation and FW-H equation acoustic analogy was performed to analyze the acoustic field of 2-D circular cylinders with different diameters.The calculating results of the standard model were compared with the experimental results and the numerical results of other researchers.The far-field aeolian noise characteristics of 2-D circular cylinders with different diameters were analyzed.The Results show that the simulation results of the standard model are very close to the experiment results，indicating the rationality of the simulation.The peak frequency of sound pressure level of the far-field receiver decreases with the increase of the diameters of 2-D circular cylinders，and is close to the peak frequency calculated from the Strouhal number 0.2，which is considered to be the theoretical value.The overall sound pressure level of the far-field receiver under conditions of 2-D circular cylinders with diameters of 10~38 mm increases almost linearly with the diameter.With the increase of Reynolds number，the overall sound pressure level and a-weighted overall sound pressure level have an upward trend in the sub-critical range and a downward trend near the super-critical range.