This paper provides a comprehensive review of the bond behavior of carbon fiber-reinforced polymer (CFRP) systems used to strengthen damaged steel structures, focusing on the impact of key characteristics such as CFRP modulus, adhesive performance, bond length, adhesive layer thickness, and bond joint geometry. It also examines the effects of environmental factors, including elevated and sub-zero temperatures, moisture, corrosion, humidity, wet-dry cycles, ultraviolet radiation, and freeze-thaw cycles, on the bond behavior. The review highlights the importance of understanding these factors to enhance the long-term durability and efficiency of CFRP-strengthened steel structures. Key findings include the need for developing adhesives with improved mechanical properties and weather resistance, optimizing bond joint geometries to enhance bond strength, and implementing effective measures to mitigate environmental degradation. The study aims to provide guidance for future research and practical applications in the field of CFRP strengthening of steel structures.This paper provides a comprehensive review of the bond behavior of carbon fiber-reinforced polymer (CFRP) systems used to strengthen damaged steel structures, focusing on the impact of key characteristics such as CFRP modulus, adhesive performance, bond length, adhesive layer thickness, and bond joint geometry. It also examines the effects of environmental factors, including elevated and sub-zero temperatures, moisture, corrosion, humidity, wet-dry cycles, ultraviolet radiation, and freeze-thaw cycles, on the bond behavior. The review highlights the importance of understanding these factors to enhance the long-term durability and efficiency of CFRP-strengthened steel structures. Key findings include the need for developing adhesives with improved mechanical properties and weather resistance, optimizing bond joint geometries to enhance bond strength, and implementing effective measures to mitigate environmental degradation. The study aims to provide guidance for future research and practical applications in the field of CFRP strengthening of steel structures.