Patterns in the outbreaks of senile diseases were investigated on 1, 264 workers by special examination among the 43, 210 industrial workers by the screening test performed in Kwang-ju and Chon-nam Branch of Korean Industrial Health Association from January 4 to December 31 in 1991. The results are summarized as follows : 1) Prevalence rate of senile diseases of industrial workers was 2.9%. And prevalence rate according to the kinds of senile diseases was observed in the order of hepatitis (0.9%), hypertension(0.7%), diabetes mellitus(0.5%), anemia(0.4%). 2) Prevalence rate of complicated senile diseases of industrial workers was 0.5%. And prevalence rate according to kinds of complicated senile diseases was observed in the order of others hypertension and arteriosclerosis (0.1%), HBV and others chronic hepatitis(0.1%), essential hypertension and arteriosclerosis(0.03%), iron deficiency anemia and leukopenia(0.03%).