This survey was carried out to investigate the fatality of the newborn beef calves in three ranches in Cheju area. The results were summarized as follows : 1. The fatality rate was 5.8%(67 calves) from the total 1, 160 calves examined. 2. There were pneumonia(46%), enteritis(16%), suckling disorder(13%), theileriasis (4%). and hypomagnesemia(4%) in dead calves. 3. Most of dead calves(78%) with 52cases died within 30days postparturition. 4. Bacteria-induced fatal diseases in newborn calves within 30 days postparturition might be closely associated with maternal immunity by the lack of immnunoglobalin of strum.