Abstarct: In this study,a paste membrane using “benzo-15-crown-5”,as ionophore, graphit powder as a bed, sodium tetraphenylborate (NaTPB) as a promoter in electrical conductivity, carbon nanotube as modifier and paraffin as softening were employed for constraction of silver ion electrode. These ingredients were packed at the end of a 3 mm-diameter insulin syring. The effects of membrance composition on the electrode performance were evaluated. Under the optimum conditions, 62.95% graphite poweder, 1.80% ligand, 30.57% paraffin oil, 3.60%carbon nanotube and 1.08% sodium tetraphenylborate, the electrode shows a nernestian slope of 59.43±1.56 mv in the concentration range of 1×10^(-5) M to 1×10^(-2)M of silver ion at 25˚C. the detection limit for this electrode was calculated to be 1×10^(-5)M. the electrode has a response time of less than 12 secend and could be used 21 days without any serious change in it,s sensivity in the pH range of 2 to 5. The electrode was successfully employed in the potentiometric titration of silver ion with KSCN. The influence of some interfering ions was also investigated and the selectivity factors were determined. The applicability of this electrode was tested for determination of silver in real samples such as radiographic films.