The purpose of this study was to compare and evaluate the stress distribution of mandible according to five different design of toothimplant supported removable partial denture, designed to prevent the movement around various axis of rotation and distribute the stress in the case of free end partial denture by placement of implant at both 2nd molar area . For this study, a three-dimensional photoelastic stress analysis method was used. In the model which only six anterior tooth are remained, two implants were installed at both 2nd molar area. In all five case, lingual bar was designed as a major connector and Akers clasps were designed for direct retainer of canine which were composed of cingulum rest and casting circumferential clasp using mesio-buccal undercut of canine. At the posterior implant, Akers clasp(A-AIRPD), Konus crown(AKIRPD), Long rest(A-LIRPD), Dalbo abutment(A-DIRPD) and O-ring abutment(A-OIRPD) were designed.. After this five Bilateral removable partial dentures were positioned on the photoelastic epoxy resin models, and In the stress freezing furnace, the vertical and oblique load(15°Δ) of 60 Ncm was applied on the central fossa of mandibular right the 1st molar artificial tooth of the every removable partial dentures. After the stress freezing cycle of 15 hours, these models were sliced mesio-distally with a thickness of 6ßÆ. The sliced specimens were examined with the polariscope and transmission photoelastic device to observe the distribution of stress and the result were as follows.