With the continuous advancement of bridge engineering technology， the efficiency and accuracy requirements for steel bridge design are increasingly increasing. As a core component of bridge engineering， the design quality and construction efficiency of steel bridges directly affect the success of the entire project. Therefore， exploring advanced modeling techniques to improve the efficiency and quality of steel bridge design has become an important trend in industry development. CATIA， as a powerful 3D CAD software， has gradually shown its advantages in the design of steel structure bridges， especially in parametric modeling. The article aims to explore the parametric modeling technology of steel bridges through the application of CATIA software， in order to improve the efficiency， accuracy， and reliability of steel bridge design.