Based on professional needs, this book introduces the basic concepts, basic principles and basic methods of fluid mechanics, and strives to be rich in content, wide in coverage, and highly practical. In order to enhance students' theoretical knowledge base and expand students' knowledge, this book focuses on the description of physical concepts and phenomena. The content arrangement emphasizes the close integration of fluid mechanics and the secondary disciplines of civil engineering, as well as the application of fluid mechanics in civil engineering. Starting from the professional background that students are familiar with, we strive to be practice-oriented, apply what we have learned, and help students better master the knowledge of fluid mechanics. This book covers all aspects of fluid mechanics in civil engineering, including: hydrostatics and dynamics, fluid mechanics in HVAC, flow problems in hydraulic engineering, seepage in civil engineering, overview of structural wind engineering, etc., With sufficient professional breadth.