In this paper, based on the principle oflaser cure, using the semiconductor laser with Wavelength 650 nm, we developed a laser cure instrument for brain blood-oxygen. The arterial part of a nose can be directly irradiated by a laser head, and the laser beams affect directly on the blood of a circulation system. It can decrease the blood viscosity, increase the quantity of blood oxygen and deformation ability ofred blood cell. Simultaneously, both the temples of a brain are also irradiated to dilate the blood vessel and just a neural system. Clinical examination shows that the instrument has not only the function of health protection, but also the therapeutic function for brain arteriosclerosis, and also can cure other illnesses, such as neurasthenic, insomnia.