In this thesis, the catalyst Pd/DNA@MWCNT S investigated was in the carbon-carbon coupling reactions. It was demonstrated that Pd/DNA@MWCNT S can act as an efficient catalyst for suzuki and sonogashira reactions in normal conditions [geen solvent (Ethanol: Water)،65? and 25? temperature] which provided the corresponding products in good yields. More importantly، this catalyst can be reused for at least seven successive runs without any discernible decrease in its catalytic activity and no remarkable changes were observed in catalyst structure.