Antireflection thin film is one very important kind of material in optical field,but traditional an-
tiref lection films such as MF2 and ZnS have some shortcomings,making them fall short of meeting today's requirements.We here give a review of progress in the DLC and CN film research and discuss possibilities of using the film as antireflection thin film in some fields.In theoretical and practical terms,we conclude that there are good prospects for these films to be used as antireflection film.