Currently, Low-level laser therapy (LLLT) is widely used in medicine and dentistry. It has been suggested that LLLT may be beneficial in management of many different medical conditions, including pain, wound healing and nerve injury. Stimulation with LLLT can enhance bone repair as reported in experimental studies on bone defects and fracture healing also. As far as hard tissue is concerned, the biostimulating effect of laser has been demonstrated more rapid healing of tibial bone fracture in mice. This study was performed to compare new bone formation between with LLLT and without LLLT. Two cylinder implants(5mm diameter, 5mm length) were implanted on rabbit's tibia. LLLT was done to one implant with 632mm diode laser. And than Rabbit's were sacrificed after 2nd, 4th, 6th, 8th weeks after implantation. Bone with implant were removed and fixed with 10% formaline. Undecalfied sample were prepared after spurr low resin embedding. Sample were grind and polished to 100㎛. The results were as follows. The amount of trabeclue of experimental group were superior to that of control group from 2 weeks to 8 weeks. There were no difference in arrangement of trabecule between two groups. Bone implant contact were significantly increased at 4th weeks in experimental group. The number of ostecytes in trabecule were different at 4th weeks experimental group. Osteone were appeared dominantly at 6th weeks experimental group, while at 8th weeks experimental group were superior than control group. LLLT group showed increased amount of trabecule, bone implant contact, number of osteocytes & osteone. It suggested that LLLT might be increase the bone formation rate and accelerate the bone formation time.