Abstarct: Solid oxide fuel cells (SOFC) are one of the most important devices producing clean energy. The functionality of an electrolyte as most important part of a SOFC is to transport oxygen in the form of O2- from cathode to anode under a gradient of electrochemical potential of oxygen. Zirconia baxsed electrolytes due to its high chemical and thermal stability were considered as the most commercial using materials in SOFCs. From a geometry standpoint, the SOFC can be shaped into either tubular (cylindrical) or planar geometry. Gas seals are necessary to separate air from fuel along the perimeters of cathode-electrolyte-anode and cathode-interconnect-anode. Most advantage of tubular geometry over planar one is better gas sealing and less troublesome thermal stresses. Lowering the operating temperature of SOFCs from current 1000 °C to 600 °C range is a viable approach to commercialization of this technology. Towards this end, reduction of the thickness of electrolyte is desirable. Screen-printing technique is cost-effective and simple method to fabricate thin films with appropriate thickness. In this technique, YSZ powder was firstly mixed with organic vehicles in weight ratio of 3:2 to make printing inks. Then the ink was extruded through a screen onto the substrate by a squeegee. Finally printed electrolyte film was sintered at high temperature to densify the YSZ film. Important process parameters including the starting powder, printing paste composition, mesh count, printing substrate, snap off distance between screen and substrate, squeegee shape, printing time and sintering temperature. Screen printing method was used to fabricate flat electrolyte so far; and there is no report to fabricate tubular electrolyte with this technology yet. Considering special features of tubular geometry over flat one and the main characteristic of screen printing, aim of this study is to fabricate tubular thin film of 5YSZ electrolyte. In the beginning flat 5YSZ electrolyte fabricated on pure graphite substrate, then tubular electrolyte with 6mm diameter and 90 µm thickness was produced. Mechanical properties included hardness examined by Micro Vickers and Nano indentation tests, structural properties determined by SEM and XRD. Hardness obtained for 5YSZ flat electrolyte was 12.2 GPa and for tubular electrolyte was 12.9 GPa. Analyzed data considered as satisfying and proper.