Steel structure is the main development trend of green building, as one of the main industries of consumption of steel. Nowadays, due to steel structure design, material selection and other reasons, the construction of steel structure construction is not only much higher than that of concrete structure in the cost of construction, but also affects the use effect. Now, taking the steel structure gymnasium in a 9 degree seismic fortification area as an example, the concrete optimization of the roof modeling, elevation modeling, elevation material, lighting and ventilation of the building design is carried out in order to make sure safety, comfort, and beauty, at the same time reducing cost.