Aim:To observe cure effect in alveolar fossa post - extraction of teeth by irradiation of He - Ne laser, we have treated 100 cases patients of with or without laser acupuncture. Methods: Post - extraction, fifty cases wereradiated directly by He - Ne laser acupuncture in Low Energy for ten times during 3 weeks as observing group, another 50 cases were treated usually without irradiation as a control group. The recovery of epitherium in surface of alveolar fossa and reconstruction of alveolar bone were compared between two groups. Results; The recovery of epitherium in surface of fossa of extraction of teeth is more rapid in study group, but there is no difference in alveolar bone reconstruction. Conclusion:Our study suggested that the irradiation by He - Ne laser in low energy profit in promotion of repairing the damage post - extraction of teeth.