Conventional metal production ways using graphite anode emits pollutants such as CO2 and CO. This can be solved by replacing the graphite anode with the SOM anode, and YSZ is the representative SOM anode material. In this study, it was evaluated the formation behavior and characterization of CaZrO3 layer formed on YSZ anode surface due to in-situ reaction in CaCl2-CaF2-CaO electrolyte during electrolysis. The experiment was performed in three stages: compacting, sintering and CaZrO3 layer formation reaction. First, the PVA was used as a binder to manufacture YSZ granule powder, green compact was made using uniaxial press. Second, the green compact was sintered in a box furnace. Finally, The CaZrO3 layer formation reaction was performed in a glove box. YSZ plates were analyzed by SEM/EDS and XRD for CaZrO3 layer formation, morphology, component and phase analysis. The yttrium concentration eluted into the electrolyte by CaZrO3 layer formation reaction was analyzed by ICP-OES. In order to evaluate the performance of YSZ including CaZrO3 coating layer as a SOM anode, ion conductivity was measured. In this paper, the stability of SOM anode with CaZrO3 layer will be discussed.