Pluvialis is a unicellular freshwater green algae, green algae under the door, Volvocales, Haematococcus Section, Haematococcus spp. The algae can accumulate a lot of astaxanthin and red, hence the name Haematococcus, also known as rain pluvialis. Pluvialis is found in the scientific community after spirulina, chlorella, rich in nutritional value and medicinal value of food algae. Pluvialis astaxanthin content is highest microalgae, also all known synthetic astaxanthin accumulation highest organism species. Astaxanthin through the blood-brain barrier to effectively prevent oxidative damage to the retina and photoreceptor cells, indicating that astaxanthin has a good effect in the prevention and treatment of "age-related macular degeneration," improved retinal function; astaxanthin has a protective the ability of the central nervous system, especially the brain and spinal cord, can be effective in the treatment of ischemic reperfusion repeated injury, spinal cord injury, Parkinson's disease, Alzheimer's and other complications native of central nervous system damage.