Abstract: Proper calibration methods are important aspects to ensure good results of neutron ambient dose equivalent meters. The APMP.RI(Ⅲ)-S1 for the calibration of neutron ambient dose equivalent meters was introduced in this paper. The radionuclide neutron reference radiation fields and the calibration results of the metrology institutes of Korea, Australia, India, China Taiwan, China, Japan and Russia were shown. Two comparison transfer instruments were also calibrated by China Institute of Atomic Energy in the ²⁴¹Am-Be and ²⁵²Cf neutron reference radiation fields, and the calibration results were compared with the APMP.RI(Ⅲ)-S1 results. The results show that the calibration factors obtained with the shadow cone method and the distance inverse-square method of our laboratory and the reference value are consistent with each other within the uncertainties.