Abstarct: Gas sensors are type of devices which could monitor concentrations of a special gas by converting it to an electercial signal. Tin Oxide (SnO¬2) and Zink Oxide (ZnO) are of the important materials that have applications in Gas sensors. In recent years wide range of studies are concentrated on Nano-structured Gas sensors. Low dimension of SnO2 and ZnO Nano-sized sensors have increased their potential in compare with micrometer ones. The reason is their nano structure which give them high surface per volume ratio. In this thesis industrial portable sensors baxsed on nano structures were manufactured and tested in special gaseous atmospheres. Batteries with maximum voltage of 12 were used as power source. A filament was used in a substrate made of ceramic (combination of Alumina & Mollite) to prevent the direct contact of it with gas. Then Nano wires and Nano rods of SnO2 and ZnO synthesized through chemical vapor deposition method (CVD) were used as active laxyers of the sensors. Industrial Oxygen gas was used in synthesis process to concentrate on industrial aspect of the project. One dimensional nano structures then was characterized by XRD, SEM and PL spectroscopy. The sensitivity of SnO2 Nano structures to LPG was investigated. In the case of ZnO its nano structures were not stable on the substrate and thus were not suitable for sensor applications. SnO2 Nano structures have shown sensitivity and selectivity to LPG. In high temperatures the gas sensor was so sensitive to low concentrations of LPG. Thus, regarding to dependence of sensitivity to dimension of the nano rods and nano wires with less diameter, these nano structures have selected as the best choice for Gas sensors.