Feeding is the most basic activity of daily living(ADL) necessary for survival from birth and throughout the life span. Handicapped children who have feeding problem may have abnormal feeding behavior like tongue thrust, swallowing difficulty, lack of jaw stability, lack of chewing, and drooling etc. The occupational therapist designing oral motor treatment must have both complete understanding and experience of oral motor problem which handicapped children may have had .and treatment technique. Thus, this paper has the purpose to pro-vide an overview of evaluation and treatment of oral motor function.