Comparative study of the biomass production and the cyclings of nitrogen, phosphorus and potassium was carried out on the east and the northwest facing slope in the montane grassland of Mt. Soback. The maximum productions during the growing season in the east and the northwest slope were 1,150g/㎡. yr, and 755g/㎡. yr. in the August, respectively. The positive correlation was appearent between biomass production and A-layer depth of the soil and the correlation coefficient (r=.964) was very significant at 1% level. In the above ground materials, the nutrients contents were high at the early of the growing season but decreaesd gradually. In roots, however, there are no significant trend throughout the growing season. Total amounts of minerals uptaken by plants during the growing season in the east and the northwest site were 18.20 and 10.66g/㎡. yr for N, 0.046 and 0.021g/㎡. yr for P, 0.211 and 0.099g/㎡. yr for K, respectively. The turnover rate (absorbed/returned) of the nutrients in the east and the northwest site were 1.13 and 1.14 for N, 1.30 and 1.43 for P, 1.09 and 1.11 for K, and the absorption rates of minerals were 0.39 and 0.29% for N, 3.16 and 1.88% for P, 0.91 and 0.57% for K, respectively.