A vegetation survey of the native pasture was conducted in Cheju from July to September, 1980. The purpose of this investigation were, to determine the botanical composition of the native pasture and to estimate how they can be improved to the feed resources of livestock industry. The results obtained are summarized as follows: 1. Grass species existed in native pasture were 64 species with Pwceae 13, Fabaceae 8, Carduacea 12 and other 31. Most of them were identified as perennial grasses. 2. Botanical composition of major grass species were Imperata cylindrim 32.7 %, Pteridium aquilinum 18.9 70, Miscanthus sinensis 8.4 %, and Arternisia japonicn 2.8 % respectively. 3. The average dry matter yield of forage taken on the native pasture was 383 kg per 10a and these yields were increased as the growing stages progressed. 4. Seasonal distribution of edible plants were increased as the growing stages progressed.