Haematococcus pluvialis, as an important new resource food, not only is a " concentrated product " of natural astaxanthin, but also a potential protein source. Algae proteins have a variety of biological activities, such as anti-oxidation, reducing blood pressure, anti-tumor, antithrombosis and immune regulation. It will have broad prospects for development in the fields of food, health care products, medicine and dyes. At present, the haematococcus pluvialis is chiefly used for astaxanthin, which results in less application of protein source. The classification, composition, preparation method, biological activity, and application of haematococcus pluvialis protein were described in order to provide a scientific basis for the development of protein products in haematococcus pluvialis.