The high temperature H₂O/CO₂ electrochemical conversion process using solid oxide coelectrolysis (SOC) cell is potentially an efficient way to reduce CO₂ emission and to store renewable power simultaneously. In this study, the tubular solid oxide coelectrolysis (SOC) cell based on a general electrode support tube through an extrusion process, and the essential SOC cell, components, such as the electrolyte and the electrode, were then coated onto the surface of a ceramic support consecutively using a vacuum slurry and dip-coating method. The tubular SOC cell was operated while varying the operating temperature, cathode flow rate, and inlet H₂O and CO₂ composition. In this study, we have been conducted advanced and systematic experimental with the tubular SOC cell in order to experimentally approach. Electrochemical performance of tubular SOC cell is systematically investigated with various operating conditions such as operating temperature, inlet H₂O or CO₂ composition and analysis by I-V curve and EIS analysis. Finally, produced syngas is analyzed by gas chromatography through optimized operating conditions. The effect of operating conditions and syngas yields were discussed in detail.