[en] The different composition Zr-Sn-Nb alloy specimens were irradiated using a tandem accelerator by 18 MeV proton at room temperature to injection capacity of 1.5 x 10¹⁴ cm^-2 at 1 mm depth. It was observed that resistance ratio was increased by proton irradiation. The increasing point defects by proton irradiation were thought to be major reason of this phenomenon. TEM observation showed that microstructure was not changed by proton irradiation