An on-line neutron moisture measuring system for discontinuous moving materials（such as ore） mounted over a conveyor is described.A gamma density gauge was used to provide density-corrected direct readout of water content.in terms of weight percentage.Three groups of measuring signals coming from a slow neutron detector

a garnma ray detector and an electronic weigh system were together fed into a PC computer through a count card to realize data processing

recording and displaying.The prompt and average moisture content

as well as total material

pure dry material and water passing the measuring point at a certain time interval can be plotted or tabulated.