Abnormal number of deciduous teeth causes esthetic and dental problems on infants or children, which has effect on articulation disorder and emotional development as well as their physical growth. Therefore, it is important to detect dental problems early and to provide comparable indications. The purose of this study was to find out the prevalence and pattern in abnormal number of deciduous teeth. The clinical and radiographic examination was undertaken for 200 at age from 1 to 10 years and statistical analysis was done. The result were as follows. Among the examined patients, congenital missing teeth 8.6% and supernumerary teeth 36.4% were seen(p<0.05). And abnormal number of deciduous teeth was prevalent in male. Most supernumerary teeth located on middle area(88.6%) was seen(p<0.05). The most frequently missing teeth was the mandibular primary lateral incisor and the mandibular 2nd. premolar. And these teeth were mainly located in maxilla and right portion. It suggested that this study would play an important role for the basis of the demographic research of abnormal teeth in oral pathologic field