A laser therapeutic instrument JG-503 is an auxiliary therapeutic instrument for reducing blood viscosity, blood triglyceride and blood cholesterol by low intensity laser irradiation of the arterioles of patients (hereinafter referred to as this product). By using a low intensity laser with a wavelength of 650 nm, this product irradiated the ladder artery, Neiguan point, Lingdao point and Tongli point, injected monochromatic low energy photons into the blood, which combined with red blood cells and lipoprotein enzymes in the blood, thus dissolving the fat layer wrapped outside the red blood cells, effectively restoring ventilation ability and improving the oxygen carrying function of red blood cells. At the same time, the coating on the surface of red blood cells is dissolved, the negative charge on the surface of red blood cells is restored, the mutual repulsive force is increased, and the molecular structure of protein in blood can be changed.