Material science is very important and interesting on our living-life and intelligent curiosity. Relationships between structure and function of target materials enable to more search and newly create the objects. The X-ray and synchrotron radiation are powerful tools to elucidate characteristics of the materials, furthermore the neutron is a best partner of X-rays to our purposes. This series will introduce the technique of neutron using, and its scientific development in terms of the probe of the neutron. The first is giving a lecture for the generation of the neutron from a reactor or an accelerator, and a new facility of a pulsed-neutron source with some instrumentation.