By using a new reaction model for light nuclei, the double-differential cross section of total outgoing neutronwith LUNF code for n + ~(16)O reactions at E_n=14.1 MeV and 18 MeV have been calculated and analyzed. In this paperthe opened reaction channels, which have contribution to emitting the neutrons, are listed in detail. To improve thefitting results the direct inelastic scattering mechanism is involved. The calculating results agree fairly well with theexperimental data at E_n=14.1 MeV and the deviation from calculated results and experimental data in low energyregion at E_n=18 MeV has been analyzed. Since the possibility of ~5He has been affirmed theoretically [J.S. Zhang,Sci. Chin. G 47 (2004) 137], so ~5He emission from n + ~(16)O reaction is taken into account, which plays an importantrole at the region of the outgoing neutron energy ε_n<3 MeV in total outgoing neutron energy-angular spectrum. Thecalculated results inclicate that the pre-equilibrium mechanism dominates the whole reaction processes, and the recoileffect in light nuclear reactions is essentially important. By using a new reaction model for light nuclei, the double-differential cross section of total outgoing neutron with LUNF code for n + ~ (16) O reactions at E_n = 14.1 MeV and 18 MeV have been calculated and analyzed. channels, which have contributions to emitting the neutrons, are listed in detail. The results of this conjunction are fairly well with the experimental data at E_n = 14.1 MeV and the deviation from calculated results and experimental data Since the possibility of ~ 5He has been affirmed theoretically [JS Zhang, Sci. Chin. G 47 (2004) 137], so ~ 5He emission from n + ~ (16) O reaction is taken into account, which plays an importantrole at the region of the outgoing neutron energy ε_n <3 MeV in total outgoing neutron energy-angular spectrum. Thecalculated results inclicate that the pre-equilibrium mechanism dominates the w hole reaction processes, and the recoileffect in light nuclear reactions is essentially important.