The invention discloses a record broadcasting, class recording system writing stroke processing and displaying method. The method includes: judging whether the time interval between stop writing and start writing exceeds preset time; storing multiple strokes, not exceeding the preset time, in the same stroke storage unit, and drawing the multiple strokes in the same bitmap; if the preset time is exceeded, by the system, generating a new stroke data unit and a blank bitmap; displaying stroke data, as a display entity, of the same stroke data unit. By the method, the problems that the existing record broadcasting, class recording systems use a single stroke as a unit for storage, processing and display, moving and turning operations are complex, and display speed is slow are solved. During redisplay, the method does not need redrawing, stroke display information is called directly, and stroke display efficiency of the record broadcasting, class recording system in computers is increased.