The influence of doping of 1-phenyl-3,4-dimethyl-1H-pyrazolo-［3,4-b］-quinoline (PAQ5) on transport properties of charge carriers in Poly(N-vinylcarbazole) (PVK) polymer film was investigated in this paper. It can be seen from the macro relationships of current density J to electric field F that, when the electric field F is in the range of 106~ 107 V·cm-1, current density in pure PVK thin films is J∝F2.1, and in the doped PVK film with PAQ5 (4.8 wt%), J∝F2.9.The enhancement of the conductivity of the doped thin film in addition to the space charge limited current injected from the anode into PVK lay which was forming through holes transmission, there is also electronic current transported by doped particles PAQ5 which was injection from cathode. The transient photocurrent spectrums of the films measurement by Time of Flight method were analyzed. The results show that: under low electric field of 1×105~2×105 V·cm-1, the main transmission carriers in the naked PVK film are holes, and its mobility is about 7.6×10-5 cm2·V-1·s-1, while the information of electronic migration is too weak to be confirm. Carrier migration performance in the doped PVK film with 2 wt% PAQ5 is not distinct change from neked PVK film. And in the doped PVK film with 5 wt% PAQ5, the mobility of holes is about 6.0×10-5 cm2·V-1·s-1, and about 7.9×10-6 cm2·V-1·s-1 for electrons. The significant increase in electronic transport properties of doped PVK films is due to the transmission channels established by PAQ5.