Total 1,041 stool samples were collected from residents who visited Public Health Center located in Hamyang-eup and its branches located in Hamyang-gun (Baecjeon, Seosang, Seoha, Ahn-ui, Sudong, Macheon, Eurim-myeon) from January 2001 to March 2002 and were examined using formalin-ether sedimentation method. By the result of examination, C. sinensis egg positive examinees were treated with praziquantel. Total egg positive rate of C. sinensis was 16% (Table 1). The egg positive rates of males and females were 21% and 10.3%, respectively. The distinction of sex of 199 samples was not identified and those showed 13.1% egg positive rate. Egg positive rate of the age group more than 80 years old was the highest (25%) but it seems that the number of examined samples was insufficient (Table 1). Egg positive rates of 30 to 39 years old and 40 to 49 years old were 22% and 20%, respectively. We confirmed that the manhood had strong tendency for infection of C. sinensis. Also, egg positive rate of all age groups except teenage revealed more than 14% (Table 1). This result suggests that raw fish eating was prevailed among residents. Egg positive rate of residents in Hamyang-gun was much higher than the average 1.4% of whole country (MHW and KAH, 1997). Lee et al. (2002) and Joo et al. (1997) reported that egg positive rates of residents in the basin of the Geum-Gang (river) and Gyeongsangbuk-do were 9.3% and 7.7%, respectively. These areas were also well known as endemic areas of clonorchiasis. Hamyang-gun, the basin of the Nam-Gang, revealed high egg positive rate compared with other endemic areas. Also, egg positive rate of Hamyang-gun was higher than 9.5% of Gyeongsangnam-do reported by MHW and KAH (1987). We presumed that Hamyang-gun was isolated from other country and pollution level of river was relatively low. Egg positive rate of male was twice as high as than that of female. This result also suggests that males have more chances of raw fish eating together with alcoholic drinks. Therefore, it is important to control clonorchiasis of males. The active age group ranging from 30 to 50 years old revealed the highest positive rate (Table 1), in agreement with the similar egg positive rate of C. sinensis reported by Lee et al. (1993) and Joo et al. (1997) who surveyed in the Geum-Gang and Gyeongsangbuk-do. It has been suggested that the manhood have more active habit of raw fish eating and we also consider that consistent high egg positive rate of C. sinensis is due to habit of raw fish eating plus ignorance of clonorchiasis. Huh and Huh (1993) described that soldiers from Gyeongsangnam-do showed high egg positive rate in investigation of soldiers of Whacheon-gun. We could confirm that management in endemic areas is the most important to control clonorchiasis. This study suggests that periodic examination, treatment and education of residents should be continued and systematized.