Objectives : The purpose of study was to compare and analyze the effect of the Intravascular Laser Irradiation Therapy and the Exterior vascular Laser Irradiation Therapy on Hypercholesterolemia. Methods : The 73 Sam-se-han-bang hospital patients who were irradiated to the Intravascular Laser and the 57 Sam-se-han-bang hospital patients who were irradiated to the Exterior vascular Laser were the study group. They had the treatment two or three times a week, and had checked total cholesterol before and after the ten times irradiation therapy. Results : Both the Intravascular Laser Irradiation Therapy and the Exterior vascular Laser Irradiation Therapy were effective on decreasing total cholesterol. The effect on decreasing total cholesterol was more definite at the abnormal group than the border line group, and the border line group than the normal group. The effect on decreasing total cholesterol was more definite at the Exterior vascular Laser Irradiation Therapy than the Intravascular Laser Irradiation Therapy, but this result was unavailable in the statistics. Conclusion : Both the Intravascular Laser Irradiation Therapy and the Exterior vascular Laser Irradiation Therapy had available effect on decreasing total cholesterol.