Abstract: Pyropia haitanensis,an important economic cultured species in China,has attracted more and more attention from scholars.With the rise of molecular markers development,they have been widely used in the study of algae,providing efficient and valuable information for P.haitanensis.This paper introduced the main molecular marker technologies,including restriction fragment length polymorphism(RFLP),randomly amplified polymorphic DNA(RAPD),amplified fragment length polymorphism(AFLP),sequence characterized amplified regions(SCAR),sequence related amplified polymorphism(SRAP),simple sequence repeats(SSR),inter-simple sequence repeat(ISSR),and their application in genetic diversity,germplasm identification,fingerprint mapping construction,population and genetic relationship of P.haitanensis.Furthermore,the existing problems of molecular marker in the research field of P.haitanensis were expounded.The limitations of molecular marker technology and particular properties of P.haitanensis and the prospects for future development were given.