When designing a scheme, I often get asked by the owner: “Which structure is better for my project? Concrete structure or steel structure?” Or: “Which one is better, steel structure VS concrete structure?” “Which is more economical ?” Let’s first look at the characteristics of these two structures. The concrete structure is composed of steel bars and concrete. It has the features of self-heavy weight, strong integrity, resistance to superficial erosion, good airtightness. But a long construction period. The steel structure is formed by connecting steel components. It has lightweight, good elasticity but weak integrity, poor fire resistance and corrosion resistance, and poor airtightness, but the construction period is relatively short.