Novel Ag/TiO2-NTs composites have been synthesized using titanium dioxide nanotubes (TiO2-NTs) modified by (3-aminopropyl)trimethoxysilane (APS) as supports. The composites have been characterized by TEM and XRD. The better dispersion of Ag on TiO2-NTs modified by APS can be observed than that of TiO2-NTs without being modified by APS, which implies that APS is helpful for uniform nanoparticles. The electrocatalytic properties of Ag/TiO2-NTs for hydrazine oxidation were investigated in details. Excellent electrocatalytic activity was observed. The results showed that TiO2-NTs have a very good application potential as supporting materials for noble catalysts.