|Objectives: The study assessed the status of Child-Oral Impact on Daily Performances (C-OIDP) and association between socio-economic status (SES) and C-OIDP in Korean children. Methods: The study population was the citizens of Gangneung, aged 4-10 year-old, who were registered at a preschool and primary school. Finally, 1,943 among 2,489 finished the question and response (response rate 74.3%). The children completed the C-OIDP by a face-to-face interview or self-response questions evaluation. The ethic approval of the study protocol was approved form GWNUDH-IRB. Results: Twenty-five percent of the participants answered that they had difficulties on their daily performances from oral health. Problem with cleaning of the mouth was the most frequent performance to be reported and the percentage of the children who had this experience was 20.7%. Fifteen percent of the participants answered that they had difficulties on their daily performances from oral health on a daily basis. Among the children who experienced difficulties on daily performances from oral health on a daily basis, 59.3% of the difficulties on daily performances were moderate or severe effect. Lower SES was significantly associated with the rate of their daily performances from oral health. Conclusions: This study showed the status of C-OIDP in Korean children. It is suggested to establish the oral health strategy to school-based oral health promotion program. Future longitudinal research is required to determine the specific role to the relation between SES and OHRQoL for children.