Most of the genetic tests for infectious diseases have few ethical problems and directly link to treatments. On the other hand, there are many problems in performing genetic tests for hereditary neurological disorders without essential treatments. Patients who undergo a genetic test usually get few benefits when they have a positive result. Moreover, the results may influence on their family members' daily lives. Therefore, we should be careful in genetic testing of the hereditary neurological disorders, and perform sufficient informed consent, genetic counseling of the patients and their family members, and precise standardization.