Abstract：For the progressive failure of geological structures(faults，karst collapse columns) to be investigated and their microseismic activities associated with water inrush to be predicted，microseismic monitoring is firstly undertaken in a deep coal mine where the water inrush is a significant issue. The development of a technique for the event location and the analysis of microseismic events are concerned. A new optimum method is provided；the preferred measurement of focal time is the basic calculation process，and also several concepts of event location types are defined according to the actual location，e.g. within the receiver array or outside it，nearby the receiver array or far away from it. The localizing method and judgment of location type，together with the correction of velocity and the monitoring system using artificial blasting sources make the improvement of the event location accuracy be significantly possible. With the results of microseismic events and 3D illustration technique，the activities of geological structure，fracture-depth of roof and floor，and the parameters of boundary pillar are obtained. These studies indicate that it is considerably possible to predict the water inrush using microseismic monitoring with its inherent ability to remotely monitor the progressive failure caused by mining. The approach used to integrate microseismic data should be comprehensive with different interpretations from different subject views，such as geology，mining engineering and geophysics. How to make a 3D quantitative mechanical model to describe the failure region from the energy view，instead of qualitative analysis，is put forward. Apparently，it will be an important research direction with its further application associated with gas and coal projects，rock burst and so on.
