Altitudinal zones of Mt. Hanla were geoecologically investigated, and compared with climate index, according to Coniferae distribution. For climatic index, Warmth index was calculated on Mt. Hanla. With the resultsobtained, the altitudinal zones can be classified into the following three zones; Coniferous forest zone: below $43^{circ}$ (month-degrees) (above 1, 450m) Deci(u)us broad-leaf forest zone: $84^{circ}$-$43^{circ}$ (600-1, 450m) Lucidophyllous forest zone: above $84^{circ}$ (below 600m)