We have developed a neutron imaging plate (NIP) as a new neutron detector and already reported the fundamental features of the NIP. The optimization of the NIP was carried out by changing a molar ratio of converter materials to PSL (Photostimulated luminescence) materials and thickness of the NIP. Some problems such as ir-ray sensitivity and irradiation effect for the practical use of the NIP were discussed. Several examples of application of the NIP were introduced. (C) 1998 Elsevier Science B.V. All rights reserved.