Abstarct: As the population grows and demand for energy increases, the need for systems with lower energy consumption and higher efficiency is felt more than ever. Gas turbines and combustion engines are include of these systems. Thermal barrier coatings which applied to high-temperature components reduce fuel and energy consumption and increase efficiency. These coatings with low thermal conductivity, high thermal expansion coefficient, proper thermal properties and better thermal shock resistance, protect the components from degradation at high operating temperatures and extend their lifetime. The important issue is to find the most optimal coating state in terms of properties. The purpose of this study was to improve some properties of thermal barrier coatings. For this purpose, the coating of lanthanum cerate composite with alumina nanoparticles was created by a cathodic electrolytic plasma deposition method on 316L series stainless steel substrate. The coatings were manufactured at four different weight percentage of alumina nanoparticles (0-5-10-15 wt%). Hot corrosion performance of coated samples was investigated qualitatively in the presence of the Na2SO4-V2O5 molten salt at 750 ºC. The microstructure and morphology of the coatings were identified by Field Emission-Scanning Electron Microscopy (FE-SEM). Phase characterization of coated samples before and after hot corrosion was done by the X-ray diffraction (XRD) method and their results were discussed. The hardness of the surfaces was determined by the Nano-Indentation method and the effect of adding alumina nanoparticles was investigated. Examination of the test results showed that the coatings produced by CPED method are suitable for thermal barrier coatings application. it seems that coatings with good porosity and suitable adhesion were deposited by using this method. Also, with increasing the amount of alumina nanoparticles in the composite coating, as expected, the coating hardness decreased, its toughness increased and hot corrosion resistance improved.