ObjectiveTo evaluate the intelligence profile,personality and behaviour disorders of children with primary generalized tonic and/or clonic seizures.MethodsUsing Chinese modification of Wechsler Intelligence Scale for Children,Eysenk Personality Questionnaire(EPQ),and Achenbach Child Behaviour Check List,neuropsychological assessment of 35 cases aged 6-14 years and the normals with the similar age and sex were makenand compared.ResultsExcept picture completion ,all the subtests scales of children with epilepsy were significantly lower than those of the controls (P<0.01). A significant difference of average FIQ(P<0.001) was observed between experimental group (85.86) and control group (103.60).There were 13 cases(37.14%) in experimental group whose FIQ were in broderline range, FIQ of 5 cases(14.29%) was in lower range,while none abnormal in the controls.The children with epilepsy had more abnormal behaviours than that of the controls(abnormal rates were 38.71% and 6.45% respectively).Statistical analysis showed no difference of EPQ scales between the two groups.Conclusions Children with primary generalized epilepsy maybe complicate with cognitive deficit and behaviour disorder.