A carbon fiber ensemble electrode was constructed by implanting carbon fiber bundle into epoxy resin. It exhibited the steady state limiting current behavior that was a typical microdisk-electrode characteristics. It was characterized by cyclic voltammetry and chronoamperommetry. Also, the sur-face structure of mercury on ensemble electrode was studied using linear sweep voltammetry. The fast scan differential pulse stripping voltammetry was employed to analyse the aqueous solution of lead ion by decreasing the pulse width and pulse period to the value well below those normally used in pulse voltammetry. The calibration curve for lead was found to be linear as a function of concentration over the range 5×$10^{-7}$ M to 5×$10^{-9}$ M using a deposition time of 5 minute.
