A teaching aid system comprises an input module, a text editing module, a formula quick-searching module and a data storing and re-writing module, wherein the input module is used to input letters, numbers and corresponding physics Chinese and English information and formula symbols; the text editing module is used to display information input by the input module; the formula quick-searching module displays corresponding formulas according to the information input by the input module; and the data storing and re-writing module stores the information displayed in the text editing module in the format of documents, or opens the stored documents in the text editing module. The system can provide teaching aid for teachers and students, and improve the working and learning efficiency.