Abstract： Objective To study the cognitive function,its correlation with and the impact on quality of life in epileptic children aged 6-13 years in regular school.Method Cognitive function of 172 children with various types of epilepsy were measured using a computerized neuropsychological test battery including six items.Their scores across the neuropsychological measures were compared with 172 healthy control subjects from the general population strictly matched for age,sex and the region where education was accepted.The quality of life was measured in 105 cases by the Quality of Life in Epilepsy Inventory (QOLIE-31).Result (1) After adjusting for age,gender,and education,children with epilepsy performed significantly worse than healthy control subjects on 5 of 6 cognitive tasks,including Raven's progressive matrices correct number (8.6 vs.14.0),choice reaction time(620.4 ms vs.489.5 ms),word-rhyming tasks(2796.9 ms vs.2324.4 ms),simple substraction correct number(28.6 vs.35.5)as well as number comparision(1002.4 ms vs.803.1 ms),P ＜ 0.01.When an impairment index was calculated,44.2％ patients had at least one abnormal score on the test battery,compared with 14.5％ of healthy volunteers,there was statistically significant differences between the two groups,P ＜ 0.001.(2) Children with new onset epilepsy before the treatment with anti-epilepstic drugs performed significantly worse than healthy controls on 5 of 6 cognitive tasks,including Raven's progressive matrices correct number (9.1 vs.13.8),choice reaction time(625.8 ms vs.474.5 ms),word-rhyming tasks(3051.8 ms vs.2575.4 ms),simple substraction correct number (28.9 vs.35.3) as well as number comparison (942.4 ms vs.775.8 ms),P ＜0.01.(3) Cognitive performance was not related to the age of onset,type of epilepsy,therapy duration or comorbid emotional and behavior disorders,P ＞0.05.(4) 105 cases filled in the QOLIE-31 questionaire,the total score of the quality of life in the group without cognitive impairment and psychical conditions was the highest (60.5 ± 0.9),and the lowest total score was found in group with cognitive impairment and psychical conditions (54.6 ± 1.5),there were highly significant differences between the groups,P ＜ 0.001.Conclusion Almost one-half of the children with epilepsy accepting regular education had at least one abnormal score in the battery tests.Newly diagnosed untreated patients with epilepsy are cognitively compromised before the start of antiepileptic drug medication.Cognitive impairment was not related to the epilepsy-related or psychiatric variables.Cognitive impairment and mental disorders require further attention and essential therapy,which is important to the improvement of the quality of life in epileptic children.