Abstract: The measured data of fracture comprehensively reflect the influence of complex factors on macroscopic crack behavior of hydraulic concrete structure. The aging component is an important basis for evaluating crack working behavior. In this research, the crack working behavior is diagnosed based on the velocity and acceleration criteria. Considing the actual situation, the typical crack location of hydraulic concrete structure is selected to install a crack meter group, and the measured data of cracks experiencing adverse load conditions are monitored and obtained. Then, the crack statistical model reflecting the nonlinear effect of temperature is established, and the aging component is separated and obtained. Finally, the velocity and acceleration criteria are used to diagnose the aging component. The application analysis of measured fracture data shows that the fitting effect of the crack statistical model considering the effect of nonlinear temperature is good. Although the aging components of some measuring points of the cracks in a gate storehouse of a flood diversion sluice at the Wangfuzhou Water Conservancy Project do not converge, they tend to close. Thus, it is diagnosed that the cracks of the sluice are currently in a stable state. This method can reflect the time-varying law of cracks simply and reliably, and provide a reference for the diagnosis of working behavior of cracks in hydraulic concrete structures.