Abstract：In this paper, CoS and CuS were potentiostatic deposited sequentially on the surface of FTO conductive glass substrate to fabricate the FTO/CoS/CuS composite counter electrode for quantum dot sensitized solar cells. FTO/CoS/CuS composite counter electrode was prepared at a suitable voltage and electrodeposition time, and the effects of electrolytic temperature on the morphology and electrocatalytic activity of prepared counter electrode were studied. The morphology and microstructure of counter electrode were determined by SEM and TEM. UV-VIS was used to investigate the optical reflection property of counter electrode. The electrochemical impedance spectroscopy, Tafel-polarization measurments and J-V curves were used to characterize the electrochemical performance. The result indicates that FTO/CoS/CuS composite counter electrode provides higher reflectivity, superior electrocatalytic activity and lower charge-transfer resisitance at the interface of counter electrode/electrolyte. Compared with that of Au, FTO/CoS and FTO/CuS counter electrode, the photovoltaic conversion efficiency of FTO/CoS/CuS composite counter electrode is increased by 132.9%, 46.6% and 26.9%, respectively.