Abstract: Accurate analysis on over voltage in a superconducting magnet during quench process is the basis of quench protection system design for the superconducting magnet. For multi-sectioned superconducting solenoid, based on the classical assumption of ellipsoidal normal zone, three-dimensional temperatures are mapped to one dimension along the conductor and then the temperature distribution along the conductor and the resistances of each turn are obtained. The coil is treated as a circuit composed of turn resistance and turn inductance, and resistive voltage, inductive voltage and resultant voltage along the conductor are calculated, thus the peak coil-to-ground voltage, layer-to-layer voltage and turn-to-turn voltage are better estimated. This method was applied to analysis of a multi-sectione