Neutron beams can be used in a variety of research fields, and it is a very useful tool for studying cultural heritages that Non-invasive testing is essential. Cultural heritage is an important key to the study of ancient manufacturing techniques and their function. Among the many non-destructive tests, X-ray technology has come to be widely used for studies on the majority of archaeological objects. In general, an X-ray cannot provide detailed information inside a thick sample because of the attenuation characteristics. Neutrons, as opposed to X-rays, are the best type of probe for examining the interior of a thick sample. However, neutrons are used far less frequently in this field because of accessibility issues. HANARO is a powerful research reactor with thermal and cold neutron. Recently, preliminary studies have been carried out to apply neutron beams at HANARO to cultural heritage. Various neutron techniques were applied to preliminary studies, for example, neutron tomography, diffraction, residual stress, and so on. In this presentation, I would like to present the results of applying neutron beams to preliminary studies of cultural heritage, especially hidden relics.