As the main structure of gas field surface engineering, steel structure has been widely used among pipe rack construction, light steel structure building and river crossing engineering in natural gas treatment plants. In certain gas processing plant, high-strength bolts connection is adopted for its steel pipe rack to form stable space structure to replace traditional welding structure, and cantilever structure, instead of the traditional simply supported steel truss structure, is used for river crossing of export pipeline. The application and innovation of steel structure in this project was a combination of theory and practice, initiating a new concept of steel structure design in gas field surface construction and realizing the goal of feasible technical proposal and economical cost. Through project practice, good economic and social benefit was achieved.