This study investigated the applicability of carbon nano tubes (CNTs) on the FTO-glass (Fluorine doped tin oxide, SnO2:F) substrate of the counter electrode for a dye-sensitized solar cell (DSSC). A nanocrystalline TiO2 layer was fabricated on the FTO-glass substrate of the working electrode using spin coating, and then sintered in a high-temperature furnace. The working electrode with a TiO2 thin film was immersed in the solution of N-719 (Ruthenium) dye for 12 hours. Moreover, the solution of CNTs/Ag-paste was dropped on the FTO-glass substrate of the counter electrode, and then the counter electrode was sintered in a high-temperature furnace. Finally, the DSSC was assembled, and the short-circuit photocurrent and the open-circuit photovoltage of DSSC were measured using a home-made I-V measurement system. This study also examined the effects of the mass ratio of CNTs to Ag-paste, the type of CNTs, the type of FTO-glass substrate and the sintering temperature on the short-circuit photocurrent and the open-circuit photovoltage of the DSSC. This film of CNTs markedly increased the short-circuit photocurrent from 227.3μA (conventional DSSC) to 1354.8μA (DSSC with a film of multi-walled carbon nanotubes (MWNTs)). Nevertheless, this film of CNTs decreased the open-circuit photovoltage from 0.43V (conventional DSSC) to 0.14V (DSSC with a layer of MWNTs). Most importantly, this study shows that the short-circuit photocurrent of the DSSC with a film of MWNTs on the counter electrode (1354.8μA) is not inferior to that of DSSC with a thin film of platinum on the counter electrode (1263.7μA).