Objective To explore the diagnostic value on the monitoring of 24 hours AEEG in atypical epilepsy.Methods The monitoring of 24 hours AEEG were performed in 21 patients with atypical epileptic seizures, and observed their clinical manifestation.Results 21 patients with atypical epileptic seizure were not showed epileptiform discharges in routine EEG, but could show many paroxyomal spike waves, sharp waves, spike and slow wave complex, sharp and slow wave complex in AEEG, and the patients' conditions were controlled after they were treated by antiepileptic drugs.The epilepsy can be diagnosed.Conclusion The monitoring of 24 hours AEEG can diagnose the patients with atypical epilepsy.