Abstract: We propose belt tearing detecting system based on closed-loop exposure compensation, and carry on model fitting for illumination and noise relations by CCD sensor photon flow theory, and choose illumination standard and algorithms used in this paper by contrast the evaluation index of quality-time δ, then design the construction of detection system from the sensor layer, quantification layer and control components. With analysis of adaptive exposure compensation driver, we analyze the system control logic and image Curvelet, segmentation, horizontal pixel integral. The experiment results show that the method can significantly improve the detection accuracy and stability and effectively applied to the detection of coal conveyor belt tearing detection.