J-PARC is interdisciplinary facility with high power proton accelerator complex to be completed by 2008after 7 years construction. Materials-Life Science Facility (MLF) will be very intensive pulsed neutron and muonfacility at IMW of the accelerated proton power. The neutron peak flux will be as high as several hundred times ofexisting high flux reactors. It is highly expected that new science will be opened up by using MLF. In the presentation Iwill explain the present status of J-PARC, strategy of user programme and prospective neutron science to be performedwith it.Keywords: Proton accelerator, pulsed neutron, muon. M. AraiJ-PARC Centre, Japan Atomic Energy Agency,Tokai, lbaraki 319-1195, Japan
