Abstarct: In this study cost-effective and mass productive method of hydrothermal was used to synthesize SnO2 nano-particles with an average particle size of 10 nm in which Tin Chloride pentahydrate (SnCl4.5H2O) and NH3.H2O were used as a precursor and enhancer of solution PH respectively. The initial solution was prepared by PH 9 which was heated up to 180°C for 24 h. Structural characterization of SnO2 nanostructure has been down by employing of X-ray powder diffraction (XRD), UV-Visible and Field Emission Scanning Microscope (FESEM) techniques. FESEM analyzes show that SnO2 nanoparticles are formed more and less uniform in shape and size. Their shape looks nearly spherical with the diameters about 7-11 nm. Synthesized SnO2 nanoparticles promised good quality for gas sensing application. Nano gas sensors were designed for industrial applications using and their gas sensing characterization for liquid gas (LPG) and ethanol were investigated using gas sensor testing system (GST). The response of nano-SnO2-baxsed gas sensors to the lowest ethanol concentration of about 90 ppm was detected. It should be mentioned that response and recovery times were as quick as about 5-10s which is the topic result of this project.