A epidemiological study was condueted by autlor on 925 official reported patients with first grade legal communicable disease during the period from January 1969 to December 1970 in all area of Kangwon province. As the results of this study, the following conclusion were obtained. A) Typhoid fever 1. Of all 925 patients surveyed, typhoid fever showed the highest rate as 50.7 persent. 2. Age group from 10 to 14 years old showed the highest rates 3. High epidemic period was from june to September. 4. As for the occupatlonal distrlbution, unemployee slrowed the lriglrest late as 63.2 persent, followed by 21.1 persent in farmer and 9.4 persent in student. 5. Most of all patients(93.7%) were isolated in their own house 6. The morbidity rate was 16.0 per 100,000 population and case fatality rate was 1.76 percent 7. The mean of the duration from onset to diagnosis and curation were 11.7+-7.1 days and 25.1+-13.8 days respectively. 8. Main diagnostic method was almost the clinical examination B) Dysentery 1. Of all 925 patients surveyed, dysentery showed 44.4 percent 2. Age group from 0 to 9 years old showed the highest rate 3. High epidemic period of this disease was from April to August 4. As for the occupational distribution, unemployee showed the highest rate as 73.9 persent, followed by 17.7 person in farmers and 7.0 percent in student 5. The attack rate of agricultural area was higher than of fiching area 6. The mean of the duration from onset to diagnosis and curating duration were 10.4+-4.3 days and 15.7+-8.8 days respectively. 7. The morbidity rate and case fatality rate were 21.8 per 100,000 population and 1.45 percent, respectively. 8. Most of all patients were isolated in own house 9. Most of all patients(97.6%) were diagnosed by the clinical examination C) Diphtheria 1. As for the age distribution, 0-4 years old group showed the highest rate as 44.4 percent, followed by 27.7 percent in 5-9 years old group and 22.2 percent in 10-14 years old group 2. Epidemic season was almost in autum, winter and spring 3. The morbidity rate was 0.96 per 100.000 population and case fatality rate was high as 26.6 percent 4. 66.6 percent of this disease was isolated in their own house and others were admittend in hospital D) Paratyphold Fever 1. Most of all patients were attacked below 20 years old 2. Epidemic season was almost was almost in late summer 3. The morbidity rate was 0.53 per 100.000 population 4. The mean of the duration from onset to diagnosis and curating duration were 18.3+-1.3 day and 13.7+-0.2 day respectively.