Abstract:With the development of science and technology, filling mining has accounted for an increasingly large proportion in mining. In order to control the paste filling process better, to real-time monitor material usage, accurately measure usage amount of the packing material, make the operator real-time grasp the usage amount of paste filling material of the operation process, meet the requirement of the underground and reduce the waste packing material to diminish the investment cost of coal mine, it is required that the paste flow in the pipe should be real-time detected and controlled in the filling process, to improve the controllability of the paste filling process. The ultrasonic testing was used to realize on-line detection of the paste filling pipe flow.