Abstract: Since the reform and opening up, China's social economy has made rapid development, and the construction capacity of water conservancy and hydropower projects has been significantly improved. As an important part of water conservancy and hydropower construction project, civil engineering plays an important role in supporting the whole construction project. In the construction of civil engineering, the reinforcement construction is the most basic part,and the level of reinforcement construction technology directly affects the construction quality of civil engineering.Strict control of reinforcement construction technology is the key and difficult point of construction management.This paper analyzes the steel bar processing technology, steel bar connection technology, steel bar binding and installation technology in civil engineering, so as to clarify the key points of steel bar construction technology, standardize the construction process, and ensure the high-quality and efficient construction of water conservancy and hydropower civil engineering.