The development overview of unbonded prestressed concrete structures is reviewed, and the current status of the application of unbonded prestressed concrete in bridge engineering is emphasized. On the basis of comparing the advantages and disadvantages of the two types of bondless and bonded prestressed concrete structures, it is pointed out that bondless prestressed concrete has a broad application prospect in bridge engineering. It analyzes the current situation of scientific research and design and construction of unbonded prestressed concrete technology in China, and points out that in order to promote the application of this new technology in bridge engineering, the design theory and method of unbonded prestressed concrete bridge should be systematically studied.