Abstract：To study time-frequency characteristics and relationships between conductive interference and contact pressure, loop current and running speed, the pantograph-catenary off-line experiments under different conditions were carried out with self-developed experimental system. Current signals of different conditions were divided into different frequency bands by using wavelet analysis. The relationships between distribution characteristics of conductive interference and experimental conditions were obtained. Conductive interference mainly distributes in the low frequency-band and it decreases with the increase of frequency. The amplitude of the conductive interference decreases with the increase of contact pressure and loop current, and increases with the increase of running speed. The frequency of conductive interference increases with the increase of contact pressure, and decreases with the increase of running speed and loop current.