Abstract: The interaction reaction data of neutron with natural antimony are calculated by means of theoptical model (OPM), the Hauser-Feshbach theory with width fluctuation correction(WHF) andthe evaporation model including the preequilibrium emission(PEM) in the incident neutron energyrange between 1 to 20 MeV. The calculated results comparaed with the experimental values, anda good agreement is obtained.