This textbook is compiled based on the Chinese current code Standard of steel structure design （GB 50017-2017） focused on the basic principle of steel structure design. It introduced the basic principles of steel structure design in civil engineering constructions. The book illustrated the material property， the connections and the basic components of the steel structures. It also introduced the failure modes and the calculation method of the steel structures as well as the seismic performance ofjoints and components. It's content highlighted the principles and focuses on fostering ability for analyzing and solving problems.
　　This book can be used as the professional basic course material of civil engineering. It can also be used as a reference book for those who are engaged in overseas steel structure engineering design and for construction engineers and technicians.