The diagnosis of epilepsy is not difficult, firstly to determine whether it is epilepsy, secondly to identify the type of seizure, and finally to identify the cause or the site of brain injury. However, in about 1/3 of patients clinically, after multiple examinations and attempts to detect evidence by instruments, only seizures are seen and no abnormalities are seen in the examination indicators. Therefore, a detailed, complete, accurate and clear medical history, physical examination and neurological examination, EEG examination and relevant laboratory tests are the most important diagnostic basis. The following questions should be clarified during the diagnosis: ① whether the seizure symptoms are epilepsy; ② if it is epilepsy, what type of seizure is it and whether it is a special epilepsy syndrome; ③ if it is epilepsy, whether there is an epileptogenic focus, whether there are triggering factors and what are the triggers. Because most of the patients have a certain degree of impaired consciousness during seizures, they cannot express themselves about the seizure process, and because physicians rarely witness the patient’s seizure process, the detailed medical history mainly relies on the patient’s family or witnesses to state it, and work closely with the physician to make a correct diagnosis, so as to get timely and effective treatment and prevent aggravation. In fact, a considerable number of patients hope to get the basis for diagnosis from certain instruments, but 5%-20% of patients with seizures have normal EEG, it is important to look at the clinical symptoms so as not to delay treatment and make the condition worse before starting treatment, which is an extremely wrong understanding and should be given sufficient attention.