Thermal stability of gold nanorods (AuNRs) is mainly investigated in the thesis. Both the melting and deformation of AuNRs were observed at high temperatures. Localized surface plasmon resonance (LSPR) of AuNRs is determined by the aspect ratio of AuNRs. LSPR absorption will be changed at high temperatures. The surface of the prepared AuNRs is coated with silica by adding one or two silicon reagents. And the structure of outer silica was further stabilized by the hydrothermal method. Silica-coated AuNRs are calcined by high-temperature furnace to test their stability. The melting and deformation of AuNRs can be significantly prevented by the above treatments. Therefore, silica-coated AuNRs with the enhanced thermal stability could be usefully applied in improving photoelectric conversion efficiency of dye-sensitized solar cell.