Aim of study: This study was performed to evaluate the influence of the veneering techniques on the fracture resistance of zirconia fixed dental Prostheses supported by different abutments. Materials and methods: Forty two zirconia supported FDPs were used in this in-vitro study and divided into three groups. Group(1)FDPs were supported by tooth from two sides. Group (2) FDPs were supported by implant only and (Group 3) FDPs were supported by implant and tooth. For all groups half of FDPs were hand built-up with veneering porcelain using the layering technique and the other half was veneered using press-on technique. After cementation of all FDPs they were subjected to artificial aging program which include thermal and mechanical cycling. After that the specimens were finally subjected to fracture test in a universal testing machine at a crosshead speed of 0.5 mm / min. Results: :both abutment support and veneering technique significantly affect fracture resistance. Conclusions:Within the limitation of this study the fracture resistance of zirconia FDPs was affected by the type of abutment support. Tooth-supported restorations showed the highest fracture resistance, followed by combined tooth-implant supported FDPs and Implant-supported FDPs. Use of press-on techniques for the veneering process exhibited higher fracture resistance after artificial ageing relative to the layering technique.