In recent years, various nanostructure materials such as nanowires, nanorods and nanobelts have been studied widely due to their excellent properties. Especially, much attention was paid by researchers in the preparation of oxide nanostructure materials due to their good optical and electrical properties. Numerous oxide nanostructure materials were synthesized so far, among which SnO₂ is considered to be an important one, because it is a typical n-type semiconductor. Particularly, SnO₂ nanobelts exhibited extensive optoelectronic and gas-sensitive properties which make them being excellent candidates for a wide range of applications such as gas sensors and transparent conductive film. SnO₂ nanobelt is generally synthesized by thermal evaporation method, but it is difficult to control the shape, size and density of SnO₂ nanobelts in the thermal evaporation process. However, since the elastic modulus and conductivity of the nanobelt depend on its shape and size, it is important to control shape and size of nanobelt. Hence, in this study, we adjusted experimental parameters such as pressure during heating and concentrations of gold nanoparticle solution to control the shape and size of nanobelts. From the scanning electron microscope image, we found that the aspect ratio of cross-section was controlled by pressure during heating. The results show that we succeeded in controlling the aspect ratio of cross-section and density of the SnO₂ nanobelts. From the above, it is expected that the improvement of flexibility and transparency of a transparent conductive film could be realized.