This field experiment was undertaken to assess the effects of cutting frequency (3, 4, 5, 6 times) and N rate (0, 15, 30, 40 ㎏/l0a) on the efficiencies of cutting, the efficiency of the N, the botanical composition, and the percentage recovery and content of N of different forage species and mixed forages within a mixed grass/clover sward, 1. By increasing the cutting frequency, the efficiency of cutting(DM ㎏ per cut) to grass and total yields was reduced, whereas with legumes yield did not change or increased slightly until 5 cuttings. At 6 cuttings it reduced, Efficiency of weed yield was highest with 5 cuttings, 2. The efficiency of N (DM ㎏ per ㎏ N) to grass and total yield was highest with 15㎏ N at all cutting frequencies, It was reduced by increasing the N rate over 15㎏ N, N application to legume yield had minus value with the lowest at 15 ㎏ N, This minus value was lower under frequent cutting, 3. The ratio of grass/clover was greatly increased by increasing the N rate, but this increase was eliminated by increasing the cutting frequency, This ratio was further reduced by increasing cutting until 5 cuttings, which was the lowest. At the 6 cuttings, there was a small increase in the ratio 4. By increasing cutting (spring-summer-autumn), grass was reduced and legume increased. 5. Percentage recovery of N in the mixed sward was increased by increasing the cutting, This was mainly due to the increasing N content in the mixed forage according to the increased ratio of legume and by cutting at a younger stage, and the efficiency of N etc. 6. The efficiencies of cutting and the efficiency of N, the grass/clover ratio, the percentage recovery and the content of N in a mixed sward were all differentially influenced by botanical composition, cutting frequency, N rate and the interaction between all of these factors.