The Heavy Water Neutron Irradiation Facility of Kyoto University Reactor was remodeled in March 1996 mainly for neutron capture therapy. The remodeled facility can supply neutron energy spectra from almost pure thermal to mainly epithermal, using the heavy water spectrum shifter, and the thermal neutron filters of cadmium and boral. We will report the evaluation of the neutron energy spectra at the normal irradiation position with the multi-activation foil method for the three irradiation modes; i.e. the non-filtered, the cadmium-filtered and the boral-filtered modes. Gold foil for thermal neutrons, four kinds of resonance foils (such as gold, indium, etc.), and nine kinds of threshold foils (such as indium, aluminum, etc.), were used. The initial neutron energy spectra were calculated using a two-dimensional transport code “DOT 3.5,” and the adjustment was performed using the code “NEUPAC.” The evaluation repeatability was thought to be within about 20%.