Abstract:As a key material in water engineering, concrete's durability and stability are directly related to the safety and service life of the engineering. However, in practical application, concrete crack problems occur often, due to the various factors such as environment, load and materials. This paper targets to explore the causes of cracks in hydraulic concrete and corresponding repair technologies deeply, and analyze the applicability and effect of different repair methods, so as to provide theoretical basis and technical support for the repair of cracks in hydraulic concrete.