Sun radiometer is an important ground-based remote sensing device to observe atmospheric aerosol, and the calibration is a prerequisite to obtain the high accuracy of aerosol products. Field of view (FOV) is an important parameter of sun radiometer, and it is also a key parameter for the transfer calibration. Based on the calibration experiment of Sun-sky radiometer observation network (SONET) in 2016, the FOV of instruments obtained by transfer method (single transfer and the average result of historical transfer) and matrix scanning method were analyzed, and the result showed that the average relative error of the results obtained by single transfer, the average of historical transfer and the matrix scanning is within 2%～3%, and the max average relative error is 1.59% compared with themselves. The three methods can satisfy the requirements of the precision of FOV. The error analysis shows that the error of transfer calibration method mainly comes from integrating sphere radiance calibration coefficient, and the error of matrix scanning method is mainly caused by the laser beam. However, these three methods all have their own advantages and disadvantages. They can verify and complement each other, in order to obtain more accurate FOV of the instrument.