Phycocyanin not only was the most important light-harvesting protein of algae,but had most potential to be explored to be healthy food and medicine for people.Spirulina platensis was the most source of phycocyanin.Spirulina platensis and phycocyanin as well as their wonderful future were introduced in brief.Extraction and purification technics progress and actuality of phycocyanin from Spirulina platensis were summarized.Several extracting and purification methods were enumerated and compared.