Yttria stabilized zirconia (YSZ; ZrO2-8Wt-%Y2O3) and Ceria stabilized zirconia (CSZ; ZrO2-25wt.%CeO2-2.5wt.%Y2O3) thermal barrier coatings (TBCs) were fabricated by detonation gun spraying and tested hot corrosion by NaVO3 at 900degreesC. Hot corrosion properties of both TBCs and stabilizer behavior during the tests were compared. The microscopic degradation mechanism of zirconia based TBCs by hot corrosion were discussed.