The use of communication materials for groups includes billboards: billboards are common forms of health education, which are placed outdoors and hung on the corridor walls of communities and medical and health institutions. The main points of using the publicity column: ① It is suitable for publicizing the health knowledge needed by the target population. Because the content can be updated in time, it can keep up with the trends of health problems, such as national health policies and regulations, seasonal diseases, community health problems, major diseases, health education for key populations, hot issues in different periods, public health emergencies and so on. (2) The publicity column should be legible, the font size should be suitable for close reading, the overall layout should be beautiful, and the layout should be properly beautified with illustrations, but it should not be usurped by the host. ③ Replace it regularly. It should be updated every 1 ~ 3 months. Blackboard newspapers and billboards without glass windows should be replaced on 1 month, otherwise the illegible handwriting may affect the reading effect; A billboard with a window can be used for 3 months. (4) Place it in a place where people often pass by and it is easy to park, such as waiting room and street; The height should be suitable for adults to read, without looking up too much; At the same time, in a bright place. If you hang it in the hospital corridor, you need lighting. AC II. Manuals and leaflets are personal communication materials.