The counter electrode is an important component in dye-sensitized solar cells (DSSC) where the mediator is reduced. It consists of fluorine-doped tin oxide (FTO) glass coated with platinum to afford more reversible electron transfer. In this research for increasing energy conversion efficiency of DSSC’s, Multi-Walled carbon nanotubes (MWCNTs) were used in counter electrode. Three types of counter electrode (CE) were fabricated: (i) All platinum counter electrodes (Pt-CE) (ii) All Multi- Walled carbon nanotube counter electrodes (MWCNT-CE) and (iii) Mixed Platinum and Multi-Walled carbon nanotube counter electrodes (Pt-MWCNT-CE). All of counter electrodes prepared fabricated on FTO glasses and cells were assembled by these electrodes and its performance was measured by solar light simulator, their behavior were studied by cyclic voltammetry technique and their Structure were studied by SEM. Results revealed that enhanced efficiency was obtained by using the Pt- MWCNT-CE. Also by using this electrode, the energy conversion efficiency increased up to about 18% in comparison with standard DSSC’s. Pt-MWCNT-CE displayed the highest catalytic activity for the reduction of tri-iodide ions and lowest transfer resistance in cyclic voltammetry tests which improves photovoltaic activity of cells.