High yield bamboo-shaped N-doped multi-walled carbon nanotubes (MWNTs), containing 2.27at.% N, were fabricated by pyrolysis of pyridine at 800°C in an Ar atmosphere. The electrochemical capacitive performances of this type of carbon fiber were evaluated in 6M KOH aqueous solution. The specific capacitance of N-doped MWNT electrode is measured to be 44.3F/g at the charge/discharge current of 1mA, which is two times greater than that of the undoped one (19.9F/g). The measurements also reveal that the N-doped MWNT electrode possesses lower equivalent series resistance (0.24Ω) and higher knee frequency (1995Hz) than the undoped one. This improvement is attributed to the unique morphology and electronic properties of N-doped MWNTs.