In a fusion reactor (i.e. ITER), the use of a ceramic coating on structural material (SS3I6LN-IG) has been considered as electrical insulator. Al 2 O 3 including TiO 2 (Al 2 O 3 -TiO 2 ) is one of most promising materials as coating from a point of high electrical resistivity and so on. However, crack and peeling occur by difference of thermal expansion between substrate material and coating material. Therefore, 80Ni-20Cr was selected as the undercoating between SS316LN-IG substrate and Al 2 O 3 -TiO 2 coating. In this characterization, Al 2 O 3 -3%TiO 2 and Al 2 O 3 -13%TiO 2 were used as ceramic coating material. 80Ni-20Cr undercoating was fabricated by atmospheric plasma spray method. The thickness of 80Ni-20Cr was 50µm. Al 2 O 3 -3%TiO 2 and Al 2 O 3 -13%TiO 2 were fabricated by atmospheric plasma spray method. Thickness of these ceramic coatings are 200 and 500µm. From the results of out-of-pile test, it was clear that Al 2 O 3 -3%TiO 2 and Al 2 O 3 -13%TiO 2 coating had a good mechanical and electrical properties.