There are 12 chapters in this book, focusing on the theoretical basis of bridge specifications, the origin ofbridge design calculation formulas, and the theoretical basis and methods of computer analysis of bridges. Thisbook enables readers to understand the mechanical characteristics of bridge structures from the essence of principles and problems, and not only master solid bridge analysis theory, but also have modern calculation andanalysis ability, laying a theoretical foundation for better research and design of bridges.This book can be used as text book for graduate students majoring in bridge structure of civil engineering,and can also be used as a reference for engineers and technicians engaged in the research and design of bridges.