Feces were collected from pigs of various ages on slaughter house and swinery in the southern area of the kangwon-do. Treponema hyodysenteriae were isolated from the feces by the method of Jenkinson. and the effects of temperature on the survival of these organism were investigated. The results abtained are summerized as follows ; 1. T. hyodysenteriae were isolated from 22 fecal samples of 1, 296 samples, and showed higher incidence at 4-8week age groups than other age groups. 2. The organisms were isolated from 17 samples of 329 diarrhea samples and 5 samples of 967 non-diarrhea samples. 3. T hyodysenteriae survived long at $0-10^{circ}C$ but survived short at $37^{circ}C$ or above.