Aim: This study was carried out to evaluate clinically and radio graphically using of tunnel technique with a sub periosteal bag versus buccally flap in narrow alveolar ridge augmentation for implant placement. Objectives: Primary objective: bone width and bone density, secondary objective: soft tissue augmentation Subjects and methods: Twenty patients with narrow ridge were divided randomly into two groups. Group 1: 10 patients received buccally flap combined with allograft bone and collagen membrane. Group 2: 10 implant sites received tunnel subperiosteal bag combined with allograft bone and collagen membrane. Clinical and radiographic parameters were gathered at baseline, 6 and 9 months. Results: There were statistically significant differences between Group I & Group II at 6,9 months regarding alveolar ridge width, peri-implant probing depth (PPD),implant stability quotient (ISQ), Changes in marginal bone loss (MBL)and bone density measurements (BD) And vice versa, no statistically significant differences at6, 9 months in modified plaque index (mPI) and modified sulcus bleeding index (mSBI). Conclusions: Tunnel technique with subperiosteal bag combined with allogeneic bone was an effective technique in increasing ridge width with less marginal bone loss than buccal flap technique, the pre-implant site condition was improved with the tunnel technique compared to the buccal flap technique