Febrile seizure is a common disorder between children with age of 6 month to 6 years and its recurrence is an emotional trauma for parents. Causative factors of febrile seizure have not been completely identified. In this study we determined the correlation between causative factors and probability of febrile seizure occurrence. This study was performed on 344 children factors related to febrile seizure were recorded and the distribution of febrile seizure occurrence was identified with Pearson chi square test. Our results demonstrated that number of febrile seizures increased in evening and autumn. Also, there was a correlation between body temperature and number of febrile seizure. Finally, the history of family with febrile seizure was identified as a suitable causative and prognostic factor.