Abstract: According to a problem of the longitudinal tearing occurred in the operation process of the conveyor belt, the paper had a study on the detection method of the longitudinal tearing based on the machine vision and had a design on the longitudinal tearing monitoring and control system of the conveyor belt based on the lin e laser and ARM.A straight line laser was applied to project a laser stripe on the back surface of the conveyor belt, the S3C2440 embedded processing terminal was ap plied to control the plane array and the CMOS video camera was applied to collect the images and to process and analyze the images.When a longitudinal tearing was detected, the images and alarm signals of the longitudinal tearing would be sent to the monitoring and control software of the PC computer and the monitoring and contr ol software of the mobile phone to be displayed via Wi-Fi.The hardware of the monitoring and control system, the software of the embedded processing terminal, the fail ure detection algorithm, the monitoring and control software of the PC computer and the monitoring and control software of the mobile phone were designed.The test re sults showed that the system could remotely make an online monitoring and measuring on the longitudinal tearing of the conveyor belt and would have the advantages of the high efficient image processing, good real time performances, easy line arrangement, remote control and others.