Can private people build ancient buildings in Luoyang?

You can't. In China, ancient buildings are cultural heritage. According to the Law of People's Republic of China (PRC) on the Protection of Cultural Relics, it is forbidden to dismantle, damage or change the building components, decorations and patterns of ancient buildings without authorization. Therefore, if you want to build an ancient building, you need to obtain the approval and permission of the relevant departments and build it in accordance with the prescribed procedures and standards.