Charcot-Marie Tooth disease is the most frequent and common inherited neuropathy with the various forms and subtypes. Recently more data are available on this disease because of the recent advances in it genetic, electrophysiology, and histological, therapeutic aspects. In this review we focus on the main aspects of the disease and update the knowledge on the Charcot-Marie-Tooth type1 disease. The CMT-1A is the most frequent form of the disease and represents more than eighty percent of the all subtypes. The clinical features of all and the electrophysiological pattern can help physician to distinguish the genetic form of the different subtypes of the disease.