In the paper Hydroxy-terminated-polybutadiene (HTPB) propellant has been introduced. The bonding agents and its property of Hydroxy-terminated-polybutadiene are briefly reviewed. The development and uses of HTPB propellant are discussed, Finally it is claimed here that the high performand and high burning rete of HTPB peopellant are beening studied, and the key technique wilkl be discussed.