  This paper described a measurement of accelerator neutron radiation field at
a transport beam line of Beijing-TBF. The experiment place was be selected
around a Faraday Cup with a graphite target impacted by electron beam at
2.5GeV. First of all, we simulated the neutron radiation experiment by FLUKA.
Secondly, we chose six appropriate ERNMS according to their neutron fluence
response function to measure the neutron count rate. Then the U_M_G package
program was be utilized to unfolding experiment data. Finally, we drew a
comparison between the unfolding with the simulation spectrum and made an
analysis about the result.
